NVIDIA is apparently working on a new nForce 630a chipset to counter AMD/ATI's upcoming 690G chipset.
The 690G will arrive on February 28th. Here's some info about the nForce 630a:
supports Socket AM2 AMD Athlon 64 X2/64/Sempron Processors, NVIDIA GeForce 7050(nForce 630a), Hyper Transport Technology up to 2G, Dual Channel DDR2 533/667/800 MHz, 4 x DDR2 DIMM Memory slots, Max. Supports up to 8GB Memory, 1 x PCI-E x16, 1 x PCI-E x1, 2 x PCI Slots, On Board Graphic Max. Memory Share 256 MB, 8+2-Channel HD Audio, 10 x USB 2.0, HDMI, TV-OUT, DVI and 4 x SATAII 3Gb/s Connectors With RAID, GbE LAN.