At the end of this year, ATI will announce R680 for the enthusiast market, there wil be a R680 core, it is 55nm DX10 Unified Shader GPU. It supports CrossFire, HDMI, HDCP, UVD, PCIe 2.
In the performance sector, there is a new RV660/670. It is also 55nm, DX10 and has unified shaders, crossfire, HDMI, HDCP, UVC PCIe 2. This will probably sample in September and Production is expected to be in Jan 2008.
As for mainstream, an improved RV630 named RV635 will be available. This GPU is also 55nm, DX10 Unified shaders, CrossFire, HDMI, HDCP, UVD support and it is PCIe 2 compliant. Sampling is Sep 07 and Production is in Jan 08.