Thanks to Yvo @ Neowin.net for sending in this email he got from the Microsoft DirectX 9.0 development team.

Welcome to the March 2003 Preview release of Microsoft DirectX 9.0 SDK Update. The DirectX 9.0 SDK update - March Preview release will be available soon at BetaPlace. We make our pre-releases available to a select group of developers and enthusiasts to help us ensure that our final release is stable and secure. Your involvement is critical to this goal.