I still have no idea what the fuck Square Enix and Tetsuya Nomura were thinking of making Versus XIII a no show at TGS... It's mind blowingly insane!!
I've been speculating since this year that Versus XIII will release in Japan during December 2012 and the rest of the world sometime in 2013 before June and I'll stick with that.
With regards to Agent... Well fuck we dont know jackshit about the game and with all these GTA V rumors flying about here and there lately and considering the fact that Rockstar North is said to be developing Agent, there's no way Rockstar North is working on two games at the same time. So either Agent has been passed onto a different Rockstar Dev Team and North is working on GTA V or Rockstar North is still developing Agent and not GTA V... Regardless, if GTA V releases next year, the earliest you can expect of Agent is 2013.