It is said that AMD is going to release new generation RV7xx mid-end GPU RV730. It comes from RV770 and it will integrate 360SP so its performances will be good. It also has 12 ROP so it will reach or exceed RV670.
RV730 will be 55nm technology, possible 700MHz and it will have two versions: RV730XT and RV730Pro. They will launch market in September.