AMD has published a new Catalyst driver for Microsoft's Windows 8 Release Preview, you can download it over here.
Feature highlights of the AMD Catalyst™ feature preview driver for the Windows® 8 Release Preview:
Featuring support for the new WDDM 1.2 driver model, this new driver enables customers to utilize the model’s features as applications are updated to leverage them.
These features include:
Support for the AMD Radeon™ HD 7900 Series, AMD Radeon HD 7800 Series, and the AMD Radeon HD 7700 Series.
Native Stereo 3D support: Windows 8 natively supports stereoscopic 3D gaming and videos via compatible applications. Middleware applications will not be required for such apps.
Unified Video API: Video playback has been integrated into the DirectX® 11 API, enabling simultaneous video and gaming content. Transcoding performance may also be improved for supporting applications.
Optimized screen rotation for rotation-aware devices.
Improved sleep/resume performance.
Optimized GPU power consumption.
Support for AMD Features:
AMD Dual Graphics/AMD CrossFire™ Technology
AMD Catalyst Control Center/Vision Engine Control Center
Known issues found in the AMD Catalyst feature preview for Windows 8 (these issues will be addressed in the AMD production release for Windows 8).
AMD Radeon HD 7900, AMD Radeon HD 7800, and the AMD Radeon HD 7700 performance in DirectX 9 applications may be slower under Windows 8 vs. Windows 7.
AMD CrossFireX configurations using the AMD Radeon HD 7900, AMD Radeon HD 7800, and the AMD Radeon HD 7700 in DirectX 9 and DirectX 11 applications may be slower under Windows 8 vs. Windows 7.
AMD CrossFireX configurations using the AMD Radeon HD 7900, AMD Radeon HD 7800, and the AMD Radeon HD 7700 in OpenCL accelerated applications may cause a BSOD or system hang.
Blacklight Retribution (DirectX11 mode) played with a CrossFire configuration may result in a system crash when launching the application (32-bit OS only).
Video corruption can be seen when playing back movie trailers with Metro video player.