If I was a betting man here's how I'd play it.
Kingdom Hearts 3 - Wii - by far the soonest of the three to possibly be released, the Wii with such a huge lead, expecially in Japan, will make that decision. Runner up possibility: PS3
Final Fantasy XIV - PS3 - by 2011 or so whenever this comes out the PS3 will have a large userbase. Final Fantasy has always prided itself on breaking technical boundaries for RPGs so I expect them to continue to come out on the higher powered systems. Runner up possibility: Wii 2
Dragon Quest X - Wii 2 - This one is not going to come out for a while. The gaps between Dragon Quest games are generally larger than between Final Fantasy ones. I'd see a 2011 or 2012 release, and by that time the Wii 2 will come out. Runner up possibility: DS 2.
And one thing I can say for near certain, none of these games will come out for the 360 or the Next X-Box system. Heck Microsoft may have to scatch and claw to even get a spinoff.







