With the disappointing aftermath of the 8800 GT launch, we're better prepared to analyze expectations for what will happen with the 8800 GTS 512. Keep in mind that the 512MB 8800 GT is supposed to be a $250 part, but in reality it's selling for around $300 in the US. The GTS 512 is expected to sell for $299 - $349, but we're already hearing from manufacturers that prices will be much higher.Overall the new GeForce 8800 GTS is definitely not a bad graphics card but next to the GeForce 8800 GT is falls short. The G92-based GTS performs better than the GT but most people seem to agree that the slightly higher performance isn't worth a $100 premium over the 8800 GT.
The XFX GeForce 8800 GTS 512 at reference clocks will carry a MSRP of $349, and the overclocked XXX edition will sell for $379. The GTS 512 could possibly sell at $349, but we wouldn't be too surprised to see it priced even higher in the market given its close proximity to the 8800 GT.
The new GTS has a higher power consumption than the GT but I couldn't find much information about the noise level of the new card in the batch of reviews that was published today.