Visual Studio 11 Beta doesn't upgrade VS2010 SP1 projects

I haven't had much more of a chance to play with Visual Studio 11 Beta yet. However I thought I would mention one nice feature in the latest version. Projects and solutions created for VS2010 can be opened by VS11 without any kind of upgrade process taking place. This means that one can use the same projects and solutions in both VS2010 SP1 and VS11. Certainly makes a nice change having to go through the upgrade process for each new version of VS (even if it is usually trivial).