There will be a PC beta rofl. If there isn't, the game is in trouble.

Yoshida stated in multiple places that the betas will happen between September and October when the 1.x servers finally go offline forever for the sake of moving character data. At this point, there will be a PC beta(s) that will eventually lead to the game's release in late winter 2012 / early 2013. PS3 beta would come along sometime after.

So.. yes, there will definitely be a PC beta.