Some info about the RV630 has been leaked. This GPU is 65nm and supports 2nd generation Unified Shader, DirectX 10, Shader Model 4.0, 128-bit memory and Dual HDCP.
There are 3 variants; GDDR4, GDDR3 and GDDR2 codenamed Kohinoor, Orloff and Sefadu respectively. Konhinoor and Orlooff supports native Crossfire and PCI Express 2.0 but requires 2x3 power connector. Sefadu doesn't support native Crossfire and requires no power connector.
RV630 has UVD (Universal Video Decoder) onboard that enhances the current AVIVO technology where Bitstream Processing / Entropy Decode is done by GPU instead of CPU. RV630 is targeted to perform better than Radeon X1900GT. RV630 will be displayed at CeBIT but performance will not be revealed. There will be card samples based on A13 silicon in March with mass production slated for mid April and launch in May.