You can check out the videos on YouTube. Also they posted a very short video for PERSONA 5! They will be releasing the game next year around this time in Japan so that's about two years before it hits the rest of the world.
Persona Q looks like it will be a dungeon crawler staring the cast of P3 and P4. Persona 4 Dancing All Night will be a dancing game that might actually be fun instead of just a way to make money… And of course there's Persona 4 Arena 2.