Random thoughts on Pokémon Sword and Shield

New type busted:
The most important thing here is that the possibility of a new elemental type has been mostly denied. This means this generation will go through the remaining type combinations as usual, meaning all possible type combinations will end next generation after SwSh (Gen 9).

A seemingly expansive regional dex:
While the actual region seems muted, we will likely have a dense regional dex. It is unclear if it will be larger than Kalos, because the area covered is much smaller, but it will be larger than Alola at least. Currently there are already 30 confirmed species for the regional dex that are coming from older generations.

No major gimmick change:
While it is too early to say, the titles do not focus on a new gimmick outside of the Japanese titles, but rather the legendaries. This does not mean there won't be new gimmick(which is unlikely), but it does mean it won't be important like Megas and Z-moves.

The general consensus seems to be that new gimmick will be audience stat boosts in Gyms and Wi-Fi battles, like contests. But we will have a cross-generational form mechanic as well, and we don't know what that will be.

A limited introduction:
The first teaser has not showcased the legendaries, which is rather different from XY and SM. This confirms this region will include a smaller number of Pokémon than XY, though how small remains to be seen. Because there will be more new Pokémon in DPPt remakes and Let's GO Crystal remakes than US/UM and LGP/E, this count might end up larger than XY at the very end of the generation, but not in these games.

A colder region:
Well, it is Britain(actually, just England with some Scottish areas sprinkled to apocryphal areas). But more importantly it is a less densely populated region, which is inaccurate for England(one of the most densely populated areas of the world). This is likely so there can be more varied Ice-types here, after the long duration of limited Ice-types.

Gyms:
So far, we only have a confirmed Grass Gym. Fire/Steel, Electric, Poison/Fairy, Water, Ice, Dragon, Ground/Rock are assumed. Ground seems more likely than Rock, and Fire is more likely than Steel because it seems to be the third Gym.
Overall the structure seems to be like this, give or take:

1. Grass
2. Water
3. Fire
4. Electric
5. Ground
6. Fairy
7. Dragon
8. Ice

ehh.

Other guesses:

1. My expectation for 65 species still remain, and I still expect around 400-500 Pokémon in the regional dex.
2. Because the new gimmick seems to be not Ability based, we will probably see more unique Abilities yet again.
3. My guess for Elite Four is Bug/Flying/Poison/Normal with a Steel champion again.
4. New Eeveelution/s will be either Dragon and Steel or just Steel.
5. There probably won't be a lot of side-evos or pre-evos, if any. New form mechanic is still unknown.
6. Titles suggest the legendaries will be remarkably similar to each other, just differing in stat distribution substantially. Lots of people have mentioned that the titles probably refer to Excalibur/Caliburn and King Arthur's shield, Pridwen/Wynebgwrthucher, but sounds too much like RagnaLordmon's bases.

Rough guesses for each type looking at the map:

1. *Bug: Bug is going to a field day with this. Though even generations tend to introduce a low amount of Bug-types, Britain has tons of different insects. Even if we don't get a ton of new Pokémon, we will see return of a few with new tricks(we already know Grubbin is here, for example).
2. *Dark: Even though Britain's lore allows for many Dark-types, I don't think we will see much tbh. Probably a Dark E4, but we already have Hydreigon here, so not a lot of Pokémon can surpass it.
3. *Dragon: Obviously we are going to see a few Dragons here, but if we don't see Dragon/Bug here it would be such a waste.
4. *Electric: Industrial theme gives me some hope for more Electric-types, but past examples show such optimism to be fallacious. 
5. *Fairy: Oh yeah, Celtic themes pretty much confirm tons of Fairies, new and old.
6. *Fighting: Yeah... no. Yes, Britain has a long history with combat sports, but the regional map does not show much reason for optimism. If we got more cities then I would consider it, but as things stand, no.
7. *Fire: Same as Electric. I don't know if we can be more hopeful because of the steampunk theme, especially since this region seems to be a Cold Region™ like Sinnoh.
8. *Flying: I have no idea? We already have Fletchling, Rufflet and Hoothoot for the regional dex. Unless hey make something interesting I don't really care.
9. *Ghost: Same as Dark-types. I think people might feel spoiled after Alola, but they really shouldn't.
10. *Grass: Yeah, there will be a lot of these.
11. *Ground: We already have the Diglett mural so we might see a bunch of new Ground-types after two very limited generations.
12. *Ice: Post-game defensive Ice-types seem to be confirmed yet again. I wish we could get early route Ice-types but GF seems committed to this metaphorical horse.
13. *Normal: Industrial theme makes me interested in the possibilities. Overall pastal regions also suggest a similar thing to Kalos, ie. generic early route Pokémon will have Normal subtyping to fill the dex.
14. *Poison: Oh yeah, we are going to see a lot of these. I mean, the region is literally called disease. Britain has a lot of amphibians, poisonous plants and industrial garbage.
15. *Psychic: There doesn't seem to be a designated biome for Psychics besides walled ruins so eh...
16. *Rock: Same as Ground, but we also have tons of caves here, so we will likely see a few fossils as well.
17. *Steel: Probably the biggest thing here, we are going to see a lot of these guys here. They are popular, and they are relevant to the region.
18. *Water: Sure, this region does not have water routes, but it is still surrounded by water and ports... so....7.8/10

Notes on confirmed species:

So far we have:

1. Minccino
2. (Cinccino)
3. (Pichu)
4. Pikachu
5. (Raichu)****
6. Wishiwashi''
7. Hoothoot
8. (Noctowl)*
9. (Deino)
10. Zweilous
11. (Hydreigon)
12. Grubbin
13. (Charjabug)
14. (Vikavolt)
15. (Riolu)
16. Lucario**
17. (Trapinch)
18. (Vibrava)
19. Flygon
20. (Larvitar)
21. (Pupitar)
22. Tyranitar**
23. Munchlax
24. (Snorlax)***
25. (Rufflet)
26. Braviary
27. (Espurr)
28. Meowstic''
29. Wailmer
30. (Wailord)
31. Diglett****
32. Dugtrio*,****
33. Bounsweet
34. Steenee
35. (Tsareena)
36. (Rhyhorn)
37. Rhydon
38. (Rhyperior)
39. Hippopotas
40. (Hippowdon)
41. Snover
42. (Abomasnow)**
43. Sawk
44. Wynaut
45. Wobbuffet
46. Stufful
47. Bewear
48. Frillish
49. (Jellicent)
50. (Golett)
51. Golurk
52. Gastly
53. Haunter
54. (Gengar)**
55. Duskull
56. (Dusclops)
57. (Dusknoir)
58. (Tympole)
59. (Palpitoad)
60. Seismitoad*
61. (Bergmite)
62. Avalugg
63. (Feebas)
64. Milotic
65. Hawlucha
66. Mantyke
67. Mantine*
68. Vulpix (Regular Form)****
69. (Ninetales (Regular Form))****
70. (Wooper)
71. Quagsire
72. (Charmander)
73. (Charmeleon)
74. Charizard**
75. Budew
76. (Roselia)
77. (Roserade)*
78. Pancham
79. Pangoro
80. Growlithe
81. Arcanine
82. Inkay
83. (Malamar)
84. Axew
85. (Fraxure)
86. (Haxorus)
87. (Onix)
88. Steelix**
89. (Sneasel)
90. Weavile
91. (Cleffa)
92. (Clefairy)
93. Clefable*
94. (Chinchou)
95. Lanturn
96. Bronzor
97. (Bronzong)
98. Combee
99. Vespiquen
100. (Caterpie)
101. Metapod
102. Butterfree*
103. Eevee***
104. (Sylveon)
105. (Leafeon)
106. (Glaceon)
107. (Umbreon)
108. (Espeon)
109. (Jolteon)
110. (Vaporeon)
111. (Flareon)
112. Ralts
113. (Kirlia)
114. (Gallade)**
115. Gardevoir**
116. Electrike
117. (Manectric)**
118. Bunnelby
119. Diggersby
120. Wingull
121. (Pelipper)*
122. (Joltik)
123. Galvantula
124. Machop
125. Machoke
126. (Machamp)
127. Goldeen
128. (Seaking)
129. (Lotad)
130. (Lombre)
131. Ludicolo
132. (Deino)
133. (Zweilous)
134. Hydreigon
135. (Togepi)
136. (Togetic)
137. Togekiss
138. Noibat
139. (Noivern)

Confirmed Mythicals:

1. Mew***

Confirmed by Japanese website's image:

1. (Goomy)
2. (Sliggoo)
3. Goodra
4. Eevee***
5. (Flareon)
6. (Vaporeon)
7. (Jolteon)
8. (Espeon)
9. (Umbreon)
10. (Glaceon)
11. (Leafeon)
12. (Sylveon)
13. Mimikyu''
14. (Ralts)
15. (Kirlia)
16. Gardevoir**
17. (Gallade)**
18. Trubbish
19. (Garbodor)
20. Vanillite
21. (Vanillish)
22. (Vanilluxe)

Pokémon in items:

1. Fletchling
2. (Fletchinder)
3. (Talonflame)
4. (Remoraid)
5. Octillery
6. (Diglett)****
7. Dugtrio (from regional map)*,****

Permanent counterparts:

1. Vullaby
2. Mandibuzz(Gender counterparts of Rufflet-line)
3. Throh (Version counterpart to Sawk)
4. Weedle
5. Kakuna
6. Beedrill(Former version counterparts to Butterfree in Gen 5)***
7. Bulbasaur
8. Ivysaur
9. Venusaur(Starter counterpart to Charizard)**
10. Squirtle
11. Wartortle
12. Blastoise(Starter counterpart to Charizard)**

Version counterparts:

1. Bagon
2. Shelgon
3. Salamence (Former version counterparts of Larvitar-line in D/P).**
4. Aron
5. Lairon
6. Aggron (Former version counterparts of Larvitar-line in X/Y).**
7. Trubbish
8. Garbodor (Former version counterparts of Minccino-line in B2/W2).
9. Baltoy
10. Claydol (Version counterpart to Golurk in US/UM)

*This Pokémon has been buffed in Gen 6 or 7.

**This Pokémon has a Mega.

***This Pokémon has a signature Z-move.

*****This Pokémon has a regional variant.

''This Pokémon has alternate form.