that's the 7970 with the new architecture, the 78xx cards are meant to have the old architecture so will see a much bigger increase.
Maybe not. There are now some conflicting reports (and some driver diving) which indicates the 78xx will be CGN also. Only the ultra low end will be same architecture as 6000 series.
Some sites are saying one thing, some are saying another. Honestly although it sucks it does make more sense for all mainstream cards to be CGN and the low end to keep old architecture to save money (and drive sales of higher pricepoint units). The 78xx won't launch until late Febuary so it may be some time till we know for sure.