Is rumored to come out this Christmas. If they get it in for $600, that may be the death kneel for the Xbone. IF they match the price of the Xbone, 100% over. And it'll drive people away from the 3DS as well. The Vita is a great piece of hardware, they just have no games really worth investing in.
Disclaimer: Owner of 360, PS3, Wii U, Wii, 3DS, Vita, etc etc... No trolling. I'd prefer the Xbone to be the better system, but from a business perspective, there's no way they could stop a bundle like that.