Wikipedia already has something similar down as the GeForce GTX 560 Ti OEM. It has the same basic die as the 570 albeit with 11 SMs (352 shaders/44 TMUs) and 40 ROPs as well as the same clocks and memory interface as the 570, and a TDP of 210W. So, this particular product has less texturing power than the 560 Ti (in fact, so does the 570 and 580) but a much larger memory interface.
rumor has it tsmc(amd and nvidia's gpu manufacturer) is having trouble with nvidia's 28 nm 6xx series gpu's production. meanwhile tsmc reported that radeon hd 7xxx cards have gone into volume production.
nvidia's declaration of a new gtx 560 might be to compete with the new radeon cards. a new card is good news....still, price reductions across the lineup would have been much better imo.