Our friends from VR Zone heard NVIDIA will present its GeForce Go 8800 GS for notebooks in May. The more powerful GeForce Go 8800 GTX will follow in July, this chip will have to compete against the mobile DirectX 10 M76XT GPU from AMD/ATI:
GeForce Go GS is pretty interesting as we don't see it on the desktop SKUs yet. Looking at the Device IDs for the desktop G80 SKUs, we saw 0x0191 "NVIDIA GeForce 8800 GTX" and 0x0193 "NVIDIA GeForce 8800 GTS" but 0x0190 and 0x0192 are missing. Usually 0x0190 is the most high end SKU so it could be 8800 Ultra and 0x192 could be 8800 GS.