AMD received a ratification from the PCI Special Interest Group for implementation of PCI and PCI Express on its new RD790 chipset. This means this chipset is as good as ready to be shipped to AMD's partners.
The RD790 has been under development by ATI since before the company got acquired by AMD and should be a bit better than the RD600 chipset. The new RD790 is rumoured to be made on a 65nm process with support for HyperTransport 3.0:
The HT clock will scale up to 2.6GHz, as well as providing enough bandwidth for a stonking 42 lanes of PCI-Express 2.0 - that's enough for a couple of ATI cards in CrossFire (supporting physics, obviously), a couple of x4 lanes and a stinky x1 lane that will never get used because no one makes any boards in that form factor. No?