PCI Express 2.0 nears completion
 

A two-month clock has begun ticking for the release of PCI Express 2.0, an update designed to help the ubiquitous computer communication technology with virtualization, power management and high-end graphics cards

Does it mean that old GPUs won't work in new boards AGAIN?

I rather think it's APG 2x -> AGP 4x evolution like thingie