What game system will Kingdom Hearts 3 be for?
I'd say PlayStation 3 because FFXIII is.
They are not making any "new" Kingdom Hearts game till Kingdom Hearts 3 but they are making Kingdom Hearts 1.5 but that is a remake of Kingdom Hearts 1 and I have a felling that they will be remaking Kingdom Hearts 2 before making Kingdom Hearts 3. Tetsuya Nomura is the main director of the Kingdom Hearts and has said that Kingdom Hearts 3 will start being developed once Final Fantasy Verses 13(the game he…
Kingdom Hearts: Dream Drop Distance is an upcoming game in the Kingdom Hearts series. It is currently in development and will be released for the upcoming Nintendo 3DS system. It will continue the story of Kingdom Hearts after the latest game, "Coded". There is not much information about it yet, but it will supposedly return to the main storyline with Riku and Sora and lead into Kingdom hearts 3.
No it is not even a released game title for any system although games have been released after Kingdom Hearts II. Wikipedia says "Kingdom Hearts III is an upcoming video game of unknown release and platform. It has been the subject of much rumor and speculation, though the project has yet to begin development..."