VR-Zone managed to get not only pictures of ATi's next flagship, but a couple of benchmark figures as well. The R600 XTX managed to score 9700 in 3DMark06 at 1600x1200 while the GeForce 8800 GTX only managed around 9500 or so. The core clock is reportedly 800MHz.
There is almost certainly more performance to be gained from driver optimizations for the new card and clock speeds could always change. And, obviously, one DX9 benchmark is not the best indicator of performance. However, beating the 8800 GTX by a mere 2% doesn't seem too promising, especially with nVidia's partners overclocking 8800 GTX's as much as 10% from the reference card. I'm thinking that the impending 8800 Ultra will be giving R600 some stiff competition this Spring.