well, it is really official now. The cards are posted on newegg, out of stock, but posted with prices non-the-less.
Nvidia GeForce 470
Nvidia GeForce 480
They are actually going to be sold at MSRP (at first anyway), and at least up to this point all the ATI prices are standing firm.
My opinion is that the 470 is a complete flop when compared to ATI, it is right on par or a little better than the 5850, but for only $50 more you can get a 5870 which is a good bit faster. That makes the 5870 a better investment for the increase in performance.
The 480 is in a decent position, it is better than the 5870, but the price gap and the performance gap is not the same, however it is better, so for the price an enthusiast would most likely get it over the 5870.
That is just looking at it strictly price vs. performance. When you factor in running temp, and power consumption, I got to say ATI still has the ball in their field. Nvidia might be able to get the ball back if they can come out with a duel gpu card that blows the 5970 out of the water.