Neogohann, friend to small children and animals, was nice enough to provide us all with some lovely gifs of the new trailer I can now use for BREAK DOWN!

GRASS STARTER, obvious from Color scheme, based on a Chipmunk, Seen using what looks like Solar Beam and Night Slash

Conclusions from Available Clues - Grass/Dark evolution

FIRE STARTER, based on Fennec Fox uses what looks like Flamethrower and Extrasensory/psywave/psychic

Conclusion from Available Clues - Fire/Psychic evolution

WATER STARTER, based on not immediately obvious species of Frog, uses what looks like Water Gun/Hydro Pump, Close Combat

Conclusion from Available Clues - Water/Fighting evolution

Presence of Mirror and Sunglasses, lack of sunglasses in other shots implies possible PC customization. Trainer positions indicate movement still confined to grids overlaid on non grid structures (Think Skyarrow Bridge’s curly bit)

European influences (including Eiffel Tower) in construction indicates this region may be based on European locals, desert biome contains futuristic structures that may be enemy base, may be town or otherwise inclined facility.

Roller Skates may replace Running Shoes or Bicycle.

Stone Statue of a nondescript person with Golurk, Palpitoad, Eevee implies legendary hero/champion/gym leader/interesting but meaningless architecture.

Psychic or Ghost Gym