The Inq writes this GPU will be the NB8E and that we can expect it later this summer. They also heard this chip will have a power consumption of only 22W!
In order to fit the power envelope, lots of changes have been made, from the way the chip is manufactured to the functional units themselves. Even though these cuts will decrease 3D performance when compared to the desktop, this will be a most powerful chip for notebook market. Currently in roadmaps we have seen somewhere between Croatia and Taiwan, NB8E should come to market as NB8E-GTX, NB8E-GT and NB8E-SE. These codenames will probably end as GeForce 8800M GTX, 8800M GT and 8800M GS.
For the end, here's a teaser. For dual-PCB 7950GX2, Nvidia used G71M, mobile version of its ultra-successful G71 (7900) chip. Guess what becomes a possibility if the G80 is packed in 22W+?