CATALYST™ DX9 BRC0 display drivers are to be used in conjuction with Microsoft's DirectX9 Release Candidate (RC). This driver is currently a Beta Release Candidate (BRC) and is being provided to permit users to experience the most advanced graphics capabilities available. Please keep in mind that this driver is a Beta Release Candidate and may have outstanding bugs at present (Please refer to the errrata notes for known issues).
Some more info and DirectX 9 demo's can be found here , ATI's press release can be found here