Right, that happened once in NV's history because GK110 was still being worked on. Every other family? Big die was released along with the rest. There's no reason to assume that a GK104 situation will happen again. It COULD happen, or maybe not, but you're simply arguing conjecture. The main point i'm making is that Maxwell as an architecture has double the performance per watt of Kepler even on 28nm - even if NV remained on 28nm lithography, the gains would be huge. If you look up and down the Kepler line of chips, they all scaled linearly with additional CUDA cores. Maxwell is designed similarly with the same scaling architecture. If GM107 is twice as fast as GK107 at the same TDP, that would also apply to the scaled up chips in the rest of the family. Now the big question in all of this is transistor density. Die size on 28nm will not be inconsequential, so because of that one could argue that the big die Maxwell would have to be 20nm. That's very possible, but we're not sure.
Anyway, i'm not saying either / or will happen. Either could happen - more than one hardware website has hinted at Maxwell GTX 800s coming perhaps sooner than we think, hardwarecanucks mentioned some vague hints along these lines as well. We simply do not know. And to be clear, you could be correct. It could be 20nm. Then again, maybe not. It could be GM204, or maybe not. We just don't know. I think it's interesting to speculate. But in any case: you're 100% incorrect that GM107 isn't impressive. The fact that it is double the performance/watt of GK107 is insane. GM107 basically performs *twice* as fast as GK107 at the same TDP, and it outperforms the R7-250 by even more than that (R7-250 is a 65W TDP). That means that Maxwell will perform ridiculously well once scaled up to 250-300W TDP, and yes, even on 28nm.
If it does remain 28nm, I don't believe release is anytime imminent. I'd say summer would be my guess. As skupples said, we usually get solid rumors 6-8 weeks out from release, this has happened consistently with most GPUs in the prior 2 years. So while some sites have speculated a March April release for bigger Maxwell chips, i'd say probably...no.
Edited by xoleras - 3/9/14 at 2:07pm