It is said that NVIDIA possible cancel G200b and to release new G3x0. It will integrate 384SP and it will use 45nm technology. Its power consumption will cut a lot than G200. Its clocks will be improved to 850/2000MHz. It will match 1GB 256bit GDDR5 memory and the clock will be more than 4000MHz. It will defeat 4870X2.
Source
Note: This is unconfirmed, but I hope it is true