Hothardware has published a preview of the ATI Radeon HD 4850 RV770 graphics card.

Quote: "As many of you are no doubt aware, AMD is about to release a new line of ATI Radeon graphics cards based on the GPU that was internally codenamed RV770. Cards based on the GPU were supposed to launch next week, on June 25 to be specific, but due to some unforeseen circumstances, we are able to offer you some preliminary information and benchmark scores a little early. We've got some preliminary information regarding the Radeon HD 4850 posted and have thrown in some news regarding an as-yet-unreleased new GeForce 9800 GTX+ card as well. "
More details on Hothardware. See also the hot photos of our new ATI Girl.