Charlie Demerjian from The Inq claims the rollout of TSMC's 40nm process has been delayed to February or March of 2009.
The first one out of the gate is usually Altera, and the firm was hoping to ship 40nm parts this year, but that looks doubtful. The next big boy was Nvidia. Its next-gen part was set to tape out in September according to its engineering roadmaps. Still, if NV is as timely as usual with tapeouts, the 40nm delay won't hurt them at all.
Next on the road to pain is ATI. It was planning to have parts out weeks after Nvidia, but that likely won't happen either, because of the slip. In the end, all three big players will be out with 40nm parts at about the same time, late Q1.