We now have brand-new information for the upcoming Nvidia flagship chip "N16E-GXX", which could see a launch as early as Q4 2015.
http://www.notebookcheck.net/Nvidia-GeForce-GTX-980-990M-for-notebooks-may-be-based-on-the-desktop-GTX-980.147698.0.html
No MXM? I think yes.
http://www.ceg-hardcorecustom.com/product/ceg_nvidia_gtx_990m
I'm sceptical about the details of this, I don't think it's gonna have a variable TDP between 100 - 185 Watts, that's just too much current for a single laptop GPU. I do think that the 990M could be GM204 or cut down GM200 though, but at a more sensible lower TDP of perhaps 125-130W.
they should just use a GM200 with ~2560-2816 CUDA cores with ~140-180W TDP
Look, those firestrike(standard) scores for the SLI 980M are very very low. I have seen single card setups with better scores.
The desktop 980 score is lower then my M17X-R4 from 3 years ago when i use a 980M in it.
Typically I see 16,000 from buyers , who use 980M SLI
and the desktop 980M gives about 13000