The footage reveals the return of Igor, and the departure of the pistol-like "Evoker" used to summon Personae. Instead, it appears that the player-characters all wear glasses, which they remove in order to summon helpful spirits. Televisions will also play a major role in the game, which otherwise does not appear to diverge much gameplay-wise from Persona 3. Not that that's a bad thing, of course.
Check out the entire 17 minutes of footage after the break.