Actually the clue that a GX2 is coming is the 260+ really. Why add the 2nd shader units when it brings you so close to the 280? Because if you were to bring a 260GX2, you'd want to be sure that SLI 260+'s were going to be better than the 260GX2 alone. But what happens to the 280? It becomes the 280+ @ 55nm.

So in Q4 I vision:

GX2 260 (55nm but just the normal 260, with lower power and slightly improved clocks(only maybe on the clocks))
280+ 55nm, faster, cooler but won't keep up with the GX2 260
260+ 55nm version of what we have now with the increased shaders

Thus 280+ in SLI>260+ in SLI>GX2 260>280+>260+

This is speculative, but it's what I think the clues are pointing to. A new orderly arrangement of chips, each with it's own niche in the power lineup above.


Next year you can look to 40nm and DX11 chips. Why? Well you know that Nvidia loves introducing a feature ahead of it's being useful. We had DX10 cards while Vista was in beta. Similar with DX11. It'll be "on the radar" next year, and Nvidia will probably use it as a new wave of 40nm chips (which will really be tweaked versions of the 200) to entice people to give up their 260 SLI setups to go DX11.