A number of sites have said this meaning NVidia want this to be known. But considering its 20% higher in price than the current retail of a 5870, you best hope its 20% better (if you're a stat whore of course).
Bottom line is, Nvidia could price the 480 at a thousand euros and they're still gonna make a loss on it considering the massive trouble with TSMC. This is all about getting Fermi noticed and into the computers of enthusiasts etc.