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Each starting island has it's own professor, they form a "research group", but they offer the same starters Pokémon. Different designs, not sure about personalities. Two female profs (both young looking, like late 20s/30s), two male (one young looking, one old guy)
The character who I think might be the villain (or at least some core character), he looks like if Fujimoto from Ponyo had shorter hair and was South East Asian. There's a close-up scene of his face where he's talking (no subtitles in the trailer, can't hear his voice) and behind him is a starry backdrop.
No new Pokemon shown but some new evolutions teased maybe - there's an evolution montage sequence which shows a Charmeleon evolving into Charizard, Pikachu evolving into a Raichu, etc. a whole bunch of Pokémon evolving, the sequence has more animation than it did before, but it has the model "fade to white" and the screen fade to white as the evolution is happening (as the model is swapped, I think). It also shows Graveler beginning to evolve, but before we can see Golem, it cuts to Sunflora beginning to evolve, Magcargo starting to evolve, then Turtonator beginning to evolve... so these guys are probably getting evolutions (an alternate one for Graveler probably. It looked like a regular Graveler, not Alolan)