Don't know why a two year old news topic was bumped, but the keyward here is planning. As stated in the news post, Nomura is still busy with both Kingdom Hearts 3D and Final Fantasy Versus XIII to have any more projects on his plate right now.
So for his sake, and our sake: he hasn't started yet. Just said that he's "interested" in a sequel, and with TWENY characters in KH3D, I imagine it will be made... just not right now.
And be wary of double posting next time.