It would be a mobile game. A 2D "port" of the Persona 4 experience. Side-scrolling, but with all the dialogue, characters and battles from the 3D version in place. And that sweet art style.
Like P3P's paring down of the series' essence taken to its most extreme conclusion, basically.
If you're wondering who to thank, thank Michael Myers, whose work you may have seen here before.
Persona 4 Pixel Characters [Michael Myers]