Will be interesting to see how AMD's pricing reacts, on the surface the 7970 will eventually have to end up at 400 or below. I have a feeling AMD will be stubborn about denying the inevitable for a while again though.
I really don't think AMD will want to compete that much with Tahiti in that price segment. Facing off 680 with a card that is just inherently (considerably) more expensive to make is not sound business, and AMD cannot really throw money away for brand recognition.
I think it would be entirely reasonable for them to just keep the price higher than it should be, and make less of them, and more of Pitcairn. Concentrate on the segment where they have a winner, not the one where they lose.