nVidia with the Geforce 7800 has taken back the lead in the GPU war over his main competitor ATI that has been so far unable to release on time his new GPU supposed to replace the current Radeon X800 and X850. If rumors turn true, we should hear some news in the coming weeks. The chinese website
HKEPC has published a photo which is supposed to be the first one from the R520 GPU.

But there is no additional info beside the photo, so ATI fans will have to wait longer before getting solid news about future ATI GPU.
All future GPU will probably be only available in PCI Express format, so for your Mac it is quite obvious that we will have to wait for the first MacIntel to see the first PCI Express-based GPU in Apple desktops or notebooks.