The trailer positively impressed me, but there's still a few things I hope:
- that the region is not as linear as the artwork could imply (e.g. I hope the large plain with the two lakes is an unbroken area from the coast to the mountains); after all, part of the reason linear routes existed was the limited memory available for loading adjacent maps - which should be less of a problem with the Switch.
- around 110-120 new Pokémon, with hopefully no more than 6/7 legendaries and mythicals (a proportion close to Gen II, but please with less pre-evolutions)
- either new evolutions for older Pokémon, new regional variants, or new megas (in that order of preference)
- having more than half of the total amount of Pokémon available in game (better if in the post-game). Hopefully less Gen I and more of the other gens (I'd personally prefer Gen II and IV as they have some of my favourite designs, though I'd like to have some more Gen V Pokémon. Especially if we're going to get Gen IV remakes this gen, maybe many of those Pokémon and their Gen I/II relatives will not be here).
- most likely won't happen, but I'd really like if some trade evolutions or trade+item ones can be changed to level up-based ones.