From the looks of things it will be in 1080p and run 2 screens at that 1080p with good screen rate. Get your upgrade on if you need to!
Hardly. The tiny screens will each be 640x800 per eye totaling at 1280x800.. You don't need to have 2 screens running at 1080p, the Rift takes care of that for you. From what the information shows you hardly need more than a half-decent GPU in order for the rift be feel "immersive". I could be wrong, but there is not enough information to suggest the need of a high-end GPU or CPU.