Perhaps they are banking on the GPGPU market as well as gaming?
Perhaps the card has been designed for scientist gamers to be able to play crysis on their lunch breaks?
GPGPU sales are a bonus, they are talking up GPGPU features more than before but realistically very very little was added in terms of die space and functions to make it more a gpgpu than a plain old GPU. GPGPU is less than 1% of Nvidia's sales, even they aren't retarded enough to make a card purely based on GPGPU, or marginally, nor are they banking on GPGPU sales to break even, if they were, they'd be dead basically. Despite people thinking its a completely new architecture, its frankly a beefed up gt200b, with a few extras. Its most certainly fundamentally the same core idea's and no major changes in now anything works, just tweaks, as is the 5870 to the 4870, thats not a bad thing itself. They've pretty much spent more on marketing and software developement in the GPGPU market than they have in sales in the last year, but banking on huge market growth, however huge market growth over 5 years and it will still likely be less than 5% of their current sales numbers.
It should beat a 5870, not comftably, and not in every game, in the Nvidia games where they've always excelled I can't see them not retaining a pretty large lead in those games. Likewise in AMD's strongest games I can't really see them being spanked, but price wise I can't see them coming even close to being able to release a slightly lower clocked 5850 type part for under £300.
This is the main problem, though we see lots of 5970's, 295gtx's on OCUK forums, they are very very very low sales parts. The 5850/260gtx/4850/4870 are cards that sold hugely hugely more than the 280/295/4870x2 cards.
We'll have to see, and I think Nvidia still have to see where the new silicon comes in and then what clocks/shader numbers they can release cards at.
The less high end parts they can make and sell at a higher price, the higher the lower end price needs to be to make up for it, unfortunately its highly suspected their yields will be woeful for the top end parts. I can realistically seeing them dropping to somewhere between 256-320 shaders to get a sub £250 part realistically out there, at which point its performance will be questionable compared to a 5850.
The last and maybe most important question is, just how much DX11 stuff are they emulating rather than have hardware acceleration for, everything, or nothing, will DX11 take a huge speed hit compared to AMD. Even Nvidia are pushing now to say how big a difference tesselation is, if they have a huge speed disadvantage for it while it might perform well now, in 6 months it might be no where near as good in newer games.
Anyone remember what the next big tradeshow is and when? Hopefully they'll do a paper launch as soon as they get yield info back on the new version of the cores, then we all know where we stand(roughly) and people can decide more easily to wait or buy now.