A working PCI Express 2.0 setup was demonstrated earlier this week at a PCI-SIG meeting:
The demo was an unnamed Intel chipset and an unnamed Nvidia GPU. We are told both worked well together, it is hard to make a good demo much less take over the world with static mockups. In any case, this bodes well for PCIe2.0 launches with the next gen Intel chipsets in Q3.
We are told that there was no AMD/ATI demo to counter it, but with 2.0 being backwards compatible with 1.1, it isn't the end of the world. In any case, it will be interesting to see if anything can actually use 16 lanes of 5.0Gbps, 80Gbps is one heck of a pipe to fill. I smell SLI variants.