The 8800 based cards we've seen already have been extremely impressive. Pricey, yes, but impressive nevertheless. Yet, Nvidia isn't content with the few they have available, and soon may be planning to release five more cards based on the G80. While it's not really a shock, it is only speculation at this point, the evidence having been garnered from glimpses inside the ForceWare driver package, which references some G80 cards that don't yet exist.
Nvidia has already made clear that they intend to release another GeForce come February, and it makes sense to begin moving the G80s over the older cards. It may be a while before they are affordable, but I guess the more the merrier.