See http://blogs.technet.com/msdeployment/archive/2009/01/09/microsoft-deployment-toolkit-2010-beta-1-is-now-available.aspx for the official announcement and how to download it from the Connect website.

Please remember that this is a beta version of MDT designed for lab deployments of Windows 7 beta using Lite Touch.  Don’t upgrade your production environment and then complain that something broke :-)