The Beta is now available, so should be used instead of the older Developer Preview mentioned here.
The next version of Visual Studio is currently available for download as a Developer Preview. This release includes a new C++ compiler and Standard Library with additional C++11 support, an integrated PIX for Windows replacement called Visual Studio Graphics Diagnostics including HLSL debugging, the latest HLSL compiler, and a DDS image viewer (both legacy and 'DX10' extension variants).
Note: The VS 11 Developer Preview includes a preview version of the next Windows SDK integrated into the release which requires some build settings changes to compile DirectX SDK samples. See "Where is the DirectX SDK" for details.