First off, how cute are the Velvet Room girls in Persona Q: Shadow of the Labyrinth? Especially Margaret! Oh, and that Velvet Room theme song remix is fun.
Atlus Japan released a nice, long trailer for Persona Q today. It shows off lots of new footage of cutscenes first, and then moves onto game systems. You'll see overviews of the party system, the mapping system (this game does use Etrian Odyssey's engine, after all), the battle system, the boosting system, difficulty settings and so much more. There are plenty of funny bits tucked in as well. I love that Etrian Odyssey style F.O.E. are in these dungeons, too.
I. Cannot. Wait.