VS 2015 Update 1 is now available for download, including the updated Community edition. The VS 2015 Update 1 Redistribution packages are also available (x86, x64), as well as the Remote Debugging Tools (x86, x64, ARM). For more information, see Brian Harry's blog, the Visual C++ Team blog, and the Visual Studio Team blog.
Compiler and CRT
VS 2015 Update 1 includes a new version of the C/C++ compiler (19.00.23506). There is also a new version of the C/C++ Runtime (14.0.23506).
Note that VS 2015 can target Windows 10, Windows 8.x, Windows 7 Service Pack 1, Windows Vista Service Pack 2, and optionally Windows XP Service Pack 3. The Visual C++ 2015 REDIST does not support Windows 7 RTM, Windows Vista RTM, Windows Vista Service Pack 1, Windows XP RTM, Windows XP Service Pack 1, or Windows XP Service Pack 2 as these platforms are all outside their support lifecycle. See KB2661358.
Windows 10 SDK: VS 2015 Update 1 includes an updated Windows Tools 1.2 with the Windows 10 SDK for Version 1511 (10.0.10586). As before, this is an optional install.
.NET: There is now a 4.6.1 release including a number of Windows Presentation Foundation (WPF) improvements including a D3DImage for Direct3D 11 available on GitHub.