We know that Nippon Ichi are working on a new RPG, which is pretty much a given at any time as well as a huge 'no sh*t' kind of thing. But Dengeki PlayStation says its an action RPG. Maybe it's something like the upcoming The Witch and a Hundred Knight, as source Siliconera suggests.
Unfortunately, that's all we know for now. Stay tuned.
I like this move into action RPGs. Let's hope that it's something cool, and that it comes west.