Don't expect DX 10 beta any time soon. I don't even think DX 10 will be available for XP. But incremental update to the SDK seems to be on a 2 months basis. Hope you have bandwidth.
We have SDK releases every 2 months. Running a beta program would have marginal value to our developers because of such a small window between SDK releases.
DirectX?
Christa Carpentiere - MSFT
VimalaLawrence