We don't know what AMD will do with thier pricing , they can go one of two ways.
1. They see that there is a short supply of the 680's and no mention of any other cards just yet so they may just drop the price of the 7970 because they now know what the price of the direct competition will be.
2. The low price of the 680 may be seen as a real threat that the other models that Nvidia will release will be priced low as well and AMD will be high priced across the board , so they may jump in with price cuts now to get a head start.