it's not much info for now, but i'm happy with that bit. I finished my 10th playthrough of im@s2 yesterday (yay, i was finally able to understand the Yukiho storyline, and i got to see her true ending since i didn't get it on my very first playthrough), so i'm looking forward to anything new.
I guess this is the game they announced at TGS as "and there is also a PS3 game in development besides im@s channel and the PS4 game, and we'll release info on it soon".
Now include yakusoku, eDEN, alright* and i'm totally happy.