Rebellion Overdrive is, at this time, only confirmed for Japan. It seems fairly doubtful that it’ll make its way to the English-speaking world, as well; Square Enix has recently announced that Knights of the Crystals, which is available on Facebook, is meeting its end on February 29, 2012. Of course, there’s always a chance that demand can bring it back in the future.
It’s vaguely disappointing that Rebellion Overdrive is not a new IP, but at least we know what it is. And knowing is half the battle. We always have Sleeping Dogs to look forward to.