I'm actually pretty sure Persona Q is meant to be more Etrian Odyssey-style like in gameplay. Like, literally using the EO engine.
It's really hard to tell, but I wouldn't be surprised to see Atlus using it. Still, from the announce trailer the combat looked more like it was the classic engine at least in-battle. Possibly EO in dungeon exploration?
EDIT: Apparently they later confirmed the Etrian Odyssey team are the ones developping Q. Huhn.
Not particularly caring about Dance All Night but everything else is exciting.
Oh and you forgot to mention that Adachi has been confirmed for Persona 4 Ultimax Super Hold or whatever it's called (Arena 2)