An update to Visual Studio 2013 is now available for download.
Compiler and CRT
VS 2013 Update 3 includes a new version of the C++ compiler (18.00.30723.0). There's no new C/C++ Runtime--it still uses CRT version 12.0.21005.1 from VS 2013 RTM), but there are updated remote debugging tools packages.
Windows phone: The Windows Phone 8.1 Update emulators are now also available for download.
Improved optimized debugging: The
/Zo switch is now officially supported. See Bruce Dawson's blog for the gory details.