Something I noticed while playing it at E3 and that I did not see clearly in any video : Pikachu has a detailed texture, like fur.
I checked every other Pokémon in my party and only Pikachu had a "furry" look, every other Pokémon (the 3 starters, Rattata and Eevee) only had smooth plain color textures (with more or less details, but no fur).
I asked the Nintendo guy why only Pikachu, he said he did'nt know and maybe it would change in the final release.
Recording or taking photos that close to the screen was forbidden, I'll try to see if I can find those details on the Tree House footage.
EDIT : I could find a frame where it was a bit visible, but the YouTube compression completely kills it, the detailed fur texture is everywhere on Pikachu, it's not visible on the yellow parts on this shot but only in the middle on the brown ones :
I used a sharpen filter to make it a little more obvious despite YT's compression, but on direct footage it's really visible and looks great.
Also, notice how the texture is mirrored.