If someone refuses to give clear answers then there is probably a very good reason why.
There are other things to remember, as well, such as the fact that publishing deals can vary greatly from one to another. Even if Microsoft is publishing, there can still be a duration specified. Square or Microsoft can have an option for automatic renewal if certain conditions are met or such a provision might not be in the contract at all. It's entirely variable.
My feeling is that this is a timed deal. I can't see Microsoft paying Square for the value of the lost sales that would result from no PS4 version. Yes, Microsoft can afford it but it would be a bad investment. Now, if they bought the IP, that's a different story, but it seems like they'd announce something like that from the heavens.
The only other scenario that would make sense is if Square decided not to green-light the game but Microsoft stepped in and offered to fund/partially fund development. Again, however, it seems like they would disclose that kind of information immediately.
