It depends. if Nintendo  bought the IP outright, then its will be exclusive permanently. Funding it does not guarantee an exclusive, it usually involve in portion of the profit of the game.

Wouldn't that means the IP belongs to Platinum and this exclusivity is one of the many terms of agreement in the contract? Because usually the publisher of the 1st game would still be holding the rights, unless they(SEGA) sold it as well, much like Tecmo letting off the Fatal Frame series. That said, SEGA does make quite some of lame moves this gen. ValkyriaChronicles2 made a PSP game, VC3 never gets localized, shitty Bayonetta PS3 portjob...
To be honest I kinda wish P+ went to talk with SquareEnix/Konami instead. SE does surprising well with 3rd party lately; Konami is just an afterthought considering that they're now working on MGRising. At least with Nintendo out of the picture they can make games for all 3 platforms.

I don't really mind buying a WiiU, really. The only thing that worries me is the random decisions that Nintendo of USA makes when it comes to bringing Japanese games for localization. Remember FatalFrame 4? The fans had to do the translation work themselves. Then there's also that issue with region locking.

So far, my decision on this matter is to buy the game first, console later. This way I can wait for news of some "UltraHD edition Turbo" port and sell the WiiU copy, and at the same time wait for WiiU to release new models/upgrades/drop price