SHHHHH! Don't jinx it! SE said Spring 2010 (dear GAWD it is soooo weird to be thinking about 20-fucking-10!). And seeing as how they've been working on it for five years, I expect a prompt release (obviously, not on the same day as FFXIII).
Of course, I fear if they make a 360 version, Microshit will cock-block us all and have the game delayed until their version is done.
Might wanna check your info again, SE did not say Spring 2010 for XIV. They said Spring 2010 for XIII.
They also said XIII will release before XIV does. and since they likely (from a profits stand point) wont want to release XIV too soon after XIII, it means we wont expect XIV untill at least Summer 2010, but the honest likley hood is Fall 2010.
This is though, educated speculation based on what they have said so far. The only thing we know for certains
-XIII will release before XIV
-They said Spring 2010 for XIII
-They have only said 2010 for XIV, not when in 2010 though, but given it will be after XIII summer at earliest (at least 1 year away)
I dont think that microsoft will delay the launch of the game compleatly, they cant. If they dont wanna give the goahead for a 360 version, Sony has already given the goahead for a PS3 version, and the PC version is already goahed as well.
So if aything well get PC and PS3 and the 360 (if they do one for it) will just be delayed untill they get the goahead for that.