There has been a small rumor going around (Started in Game Trailers Forums) that somebody, magically obtained the next issue of Nintendo Power (MARCH) and they claim that KHIII is a Wii Exclusive.
Do not believe anything until SQUARE SAYS SO
First off if you go to the links:
You will see there are no scans, they keep linking you to other websites until you go back to the beginning and most of the people that post these have barely any posts on said websites. I guess it would be interesting to see a Wii KH exclusive but no offcial word yet at all, I wouldn't even trust Nintendo power lol.