KH3 will probably stay on the Playstation for now, but i wouldnt be surprised if they either ported the older 2 tot he Wii, or made some spin off, KH would have a very good home on the wii so i expect it in some form.
I dont think a straight FF game will go anywhere but on the PS3. Square are perfectionists and they will squeeze every drop of power from the PS3 with their next FF game, even if a 360 port was possible, theres no reason to justify the resourses.
Spin offs are another matter, I also wouldnt be surprised if older FF games got a revised version for the 360 or Wii, Theres a huge market on the Wii that have never played a FF game. An action based game would probably work much better on them both.







