reports, that there will be three versions of the Geforce Go 6800 successor which will differ in price and performance. It will be probably named Geforce Go 7800. The codename is supposed to be G71M. Like the Mobility Radeon X800 XT, it will have 16 pipelines and a PCIe interface.
Its little brother, the Geforce Go 7600 (Codename G73M) also has the PCIe interface, but only features 12 pipelines. The cheapest model, the Geforce Go 7200 (Codename G74M) has 8 pipelines.
The two bigger versions are even supposed to be SLI compatible. Nvidia will still use its own developed MXM standard. Release date is expected for the end of this year.