Naw, not out of line if it's 10-20 (or even 30%) faster than HD 7970.
HD 7970 would be reduced by $50-100.
And then AMD rolls out cherry-picked overclocked samples of HD 7970, and call it "GHz Edition", just like with HD 7770 and HD 7870 - except that it'd be much more than just 1 GHz (probably 1150-1200 MHz), for up to 30% perf increase.
It might be just like X800XT Platinum Edition - just something for the review sites, too limited edition supply for retail anyways (priced at $599 or so).
And GTX 680 would be right where NV wants it to be, $549.. especially given the initial 28nm supply.
Then NV might do 680 Ti and 670 Ti using 8+6-pin tower connectors and 6+6-pin flat connectors. The 680 Ti would also be more expensive, just as hot and power-hungry as GTX 580 after upping the voltage as much as possible, also very limited edition at $649 or so, just to one-up AMD's counter-move.
The competition is gonna be fierce!!!!!!!!!