AMD has released AMD Catalyst Drivers for Windows 8 Consumer Preview

Feature highlights of the AMD Catalyst driver for the Windows 8 Consumer Preview:

Release notes

Full WDDM 1.2
Highlights include:
Native Stereo 3D support: Windows 8 will natively support Stereo 3D for full-screen and windowed gaming, and video applications
Unified Video API – Video playback is now integrated within the DirectX 11 API; enabling simultaneous high quality Video and 3D content, and the potential for enhanced video transcoding performance
Optimized screen rotation
improved sleep / resume performance
Optimized Power Consumption

AMD Eyefinity
OpenC
OpenGL
UVD
AMD Dual Graphics / AMD CrossFire Technology
AMD Overdrive
AMD Catalyst Control Center / Vision Engine Control Center
Please note: A future AMD Catalyst Windows 8 driver release will add support for the AMD Radeon HD 7900 Series, and AMD Radeon HD 7700 Series in the coming weeks.

  AMD Catalyst Drivers Windows 8 Consumer Preview