I want to see Wales represented by getting some DLC! These are clearly Ireland and Scotland! Where’s Wales!!!!
I believe Spikemuth and the area around it (Route 9 Tunnel, Outer Spikemuth, possibly Circhester Bay) are intended to be the counterpart to Wales. Geographically, Wales doesn't take up a lot of space, so there honestly wouldn't be that much for it in Galar either.
I wonder though if any of the returning pokémon will have any new abilities or stat boosts. There weren't that many in the base game, but hey, Koffing got some new abilities so who knows.
The one I'd like to see the most is Lurantis getting Chlorophyll. This would help compensate for its low Speed, enough that it can do single-turn Solar Blades, heal more with Synthesis, and do Fire-type Weather Balls while going first.
Assuming all Pokémon have maxed out Speed, however, Lurantis with doubled Speed would still
barely fall short of Dragapult at Level 50, by a single point (212 for Lurantis, 213 for Dragapult). It'd fall short by 7 points at Level 100 (414 versus 421). Would outrun Barraskewda though.
If we get D/P remakes after this Expansion pass, they'll need to bring Hidden Power back since it's the only move that Unown knows.
My idea would be that if Hidden Power is still gone (and I am guessing they did so because they wanted Hidden Power to turn into its corresponding type's Max Move but couldn't do so without it being horrendously overpowered), then Unown would get new moves, possibly a new Ability to go with those moves. The Trading Card Game did just this with all three times they released the full set of Unown (26 the first time, 28 the second and third), such that there were popular competitive decks centered around them while some others were essential support Pokémon.
Reflecting the TCG's interpretation of them, for instance, Unown Q, which represents "QUICK," could have an Ability and/or new move that would have +1 priority and function like After You, which would effectively allow its partner Pokémon in a double battle to have increased priority on any move. This is, of course, offset by the fact that Unown Q has incredibly low stats, cannot do damage, and is extremely predictable due to knowing only one move. There would also need to be a lot of conditions and exceptions to keep this from being overpowered (like being unusable on Dynamax Pokémon or that the move works only once per battle).
Which brings up the question of how they're going to stop new players from becoming overpowered in the main story if they take a detour to play through the expansion pass as soon as they reach the wild area.
One possibility is to not gain any EXP at all. We don't know how Kubfu evolves, after all, and if Max Raid Battles are the main thing for both of them, they could leave that unchanged as you don't gain any direct EXP from them (though you do get EXP Candy).
It just hit me but since the expansion pack is like a third version, I guess we should expect new music for online multiplayer. There's some good music in the Vanilla version but nowhere as much as Gen 7.
What I'd like to see are new environments for online multiplayer. I know there are a limited amount of locations with enough room for both sides to Dynamax, but there are some, even in the base game, that were left out. Ones that come to mind are the Max Raid Battle dens and the Energy Plant, though I'd like to see an original, non-stadium location too.
The new areas do look kind of cool and the new pokemon and g-max pokemon look interesting. That being said my top three wishes for the expansion pass would be evolutions for the fossil pokemon, an easier way to get master balls and mints, and updated/better move sets for the new pokemon. Basically, some quality of life changes and some less derpy looking fossil pokemon.
That's the point of the fossil Pokémon though. They're also strong enough as they are; they don't need evolutions. The last thing anyone wants to see is an even tougher Dracovish, except for Dracovish users.
Of course, one reason I enjoy these new fossil Pokémon so much are not only because they reflect early paleontologists' interpretations of dinosaur skeletons, but because I had been wondering for quite a while what happens when fossils are broken into pieces. (It's also not unrealistic to keep running into only one part of a prehistoric animal's skeleton over and over. I mentioned it elsewhere, but people found dozens of Triceratops skulls before they found any other part of it. As a result, people knew what a Triceratops head looked like, but they had no clue if it was even bipedal, quadrupedal, or swam in the waters. The legs and heads being on backwards is not unrealistic either, as it took until the 1970s for palentologists to realize they've been assembling dinosaur leg bones wrong the whole time. Compare a Tyrannosaurus's legs in
Fantasia compared to
Jurassic Park, for instance.)