I'm not sure. :P I've heard rumors that that the actual KH3, not Birth By Sleep or any of those spin offs, might be on other consoles. However I don't really care. I could go over my friend's friends house and play it on his PS3. (I just don't have the money to buy a PS3.)
"Like previous Kingdom Hearts titles, Birth by Sleep will feature numerous Disney characters.[5] In addition to original characters Terra, Aqua and Ven,[2][3] confirmed characters include King Mickey,[4] Donald Duck, Goofy, young Sora and Riku, Hercules, Maleficent, Yen Sid, Cinderella, Aladdin, and Master Xehanort and his apprentice. The game will also introduce a new type of enemy different from the Heartless and Nobodies.[10]"
Wikipedia'd. Some people don't confide in Wikipedia, but it's very similar information to what I've read on many other sites.