Microsoft today launched the new Visual Studio Preview program. Similar to the Windows and Office Insider program, Visual Studio Preview program will allow users to try out the latest features coming to Visual Studio before its public release. As you can expect, Visual Studio Preview builds will have new features, bug fixes, etc. One good news is that Visual Studio and Visual Studio “Preview” can be installed side-by-side on the same device. If you are using extensions, you will need to reinstall them for each instance of Visual Studio. Also, installing both will not double the size of your Visual Studio installation as some components are shared between the two.
Like any other pre-release versions of Visual Studio, it is not supported in production environments. You should install the release version for use in Production environments.
Find more details about this program here.