Not exactly golden sources of data or clear timelines on the 1Ghz edition.
The price drop has already kicked in with the 680 GTX so I would just order one now rather than wait. If you are going to overclock anyway there isn't much reason to wait, you are almost guarranted to get over 1100mhz on any card you buy now anyway and I think it highly unlikely AMD will release a reference version running any faster than that under the 7970 label.
Thanks! ill go ahead and order a 7970 now