Theoretically, potentially; in some areas - Yes.
In reality? There will be some, but not all, advantages taken of the new AMD architecture. The status quo is likely to remain though. intel dominant in majority of areas, with AMD exceeding in a few areas. So far MS hasn't had that compelling a reason to focus as heavily on AMD as it has with intel.
W8 SP1 is a more realistic time frame for whatever 'full extent' they plan to develop. W7 SP2, perhaps a few key and easy tweaks but not the whole gamut.
Who knows, maybe a kernel/distro in linux land will be developed to harness the full power of the new AMD chips.
Unlikely - but never discount the passion of an intelligent and riled fan