I took a moment out of a very busy weekend to publish an update to MVVM Light for Windows 8 Release Preview.
You can download the DLLs from the Codeplex site. Or, if you use Nuget, you can update the MVVM Light package, which will install the newest DLLs. For more information about Nuget, visit Nuget.org as well as the MVVM Light Nuget page.
Note: I also took the occasion to fix an issue where the DLLs for the .NET 4 framework were not signed. The DLLs contained in this package are properly signed.
As usual, feedback is very welcomed!