VS 2015 Update 3 is now available for download, including the updated Community edition. The Visual C++ 2015 Update 3 Redistribution packages are also available (x86, x64), as well as the Remote Debugging Tools (x86, x64, ARM). For more information see the release notes.
Compiler and CRT
VS 2015 Update 3 includes a new version of the C/C++ compiler (19.00.24215.1 with the latest hot-fixes applied). There is also a new version of the C/C++ Runtime (14.0.24212). See these posts for details about the compiler, optimizer, libraries, and standards compliance including expression SFINAE.
Visual C++ Build Tools 2015: There is an edition of Visual Studio available without the IDE for those just looking for the compiler toolset.