I pray to god you're not referring to FFXI.. that game was HORRIBLE on 360. It completely flopped.. why would Squeenix want to risk another game after that disaster?You will be lucky to see KH3 in 2008..
Wii is more power the xbox.. Xbox was more power then the Gamecube and the Cube was more powerful then PS2. So yes it would look great on the Wii.
Funny thing is, people said the samething about FF when it went to PS1.. Yet look what happen. So you dont know if a great place or not.