"In an interview with Tetsuya Nomura, he stated that his team is currently too busy with other projects such as Final Fantasy Versus XIII to work on Kingdom Hearts III. He also stated that his team was doing research concerning the high-definition graphics of the game, and that depending on the technical limitations of the next generation consoles, Kingdom Hearts III may see a release on the existing platforms."
- Electronic Gaming Monthly. September 14, 2010. pp. 12, 13.
Well, there you have it. Kingdom Hearts III for the Playstation 3...maybe...
"During GamesCom 2010, Yoshinori Kitase cast doubt over a release within the next year (of Final Fantasy versus XIII) as he stated that Square Enix wouldn't commit to a 2011 release."
Since FFvXIII might not even be released till 2012 now (the conference regarding more details into the game isnt till January 18, 2011, we will find out more on release dates then), its highly probable that if KH3 was to be released on this generations consoles, it probably wont be slated for release til 2014-2015. Its not in production on any level yet.