Microsoft released the new AdventureWorks for SQL Server Denali (CTP1, aka SQL Server 2011) yesterday!
The release notes:
This release is dedicated to the Adventureworks sample databases that ship for Microsoft SQL Server code-named “Denali”, Community Technical Preview 1 (CTP1). This release uses the AdventureWorks2008R2 and AdventureWorksDW2008R2 sample databases. They have been upgraded to the “Denali” CTP1 version and the FILESTREAM properties have been removed from the Production.Document table. No additional schema or data changes have been made.
Note: These databases cannot be installed on any version of SQL Server other than SQL Server code-named “Denali” CTP1.
Get it here.