Microsoft announced beta versions of Visual Studio 11 and .NET Framework 4.5.
Compatibility with previous releases
.NET 4.5 is an in-place update of .NET 4 and provides very high app compatibility for all .NET 4 scenarios
You can install and use Visual Studio 11 Beta alongside Visual Studio 2010
Visual Studio 11 Team Foundation Server Beta requires 64-bit versions of server operating systems when installing on Windows Server (see Visual Studio 11 Team Foundation Server Beta system requirements)
Metro Style App Project Templates
Metro style simulator
Reduced toolbar commands