Guys it really is damn clear how it is going to pan out.
7800 are based on VLIW4 but 28nm just like current cards but more efficient and at much lower price point so will be very good for mining.
7900 are based on CGN new thing at 28nm and we don't know how (in)efficient it will be at mining.
Fixed your post. If the price point of cards fall then you get same hashing power for lower price and lower electrical draw. How exactly would that be bad for mining?
5870 cards are the best for bitcoin mining ! There will be no replacement for them in the future, sadly. Maybe I should stock up on some more !?
Actually the 5970 is better for mining however the only reason they are good for mining is the price has been reduced. 5970 @ today's $400 to $500 per card = good deal in MH/$. 5970 at initial retail of $780 per card = not so good deal in MH/$.
It is getting harder and harder to buy 5970s even on ebay. Got outbid on 4 auctions today (trying to get them for $350 per card).