UPDATE: Microsoft has released the official preview of the next version of Visual Studio currently known as Visual Studio 2015. Download it from here.
Microsoft has recently released the first CTP for Visual Studio 2014. Feel free to download it if you’re interested. But a very big word of caution – it cannot be installed on any machine running a previous version of Visual Studio. There is a check in the installer to prevent it (although you can work around it if you are feeling brazen). Therefore you’ll want to use a virtual machine.
The release notes are here. There isn’t too much mentioned so far beyond bringing in the ASP.NET vNext framework and lots of standards change for C++ and, of course, the use of Roslyn. You can download it from MSDN Subscriber Downloads or: