I'm not actually sure that's a new socket. The r2 hints at it being a revision, not a replacement. With just that as evidence, I'm thinking it's more like a new chipset that will enhance the abilities of the new CPUs (think H55/H57 versus P55, not LGA1366 versus LGA775). It just doesn't fit AMD's philosophy to introduce a new socket only in the high end. If both mainstream and enthusiast markets had "AM3r2" listed, it would have been more likely to be a new socket.