The Windows 10 April 2018 Update (a.k.a. Version 1803) is now available along with the Windows 10 SDK (10.0.17134). The new SDK can be installed via VS 2017 (15.7 update) [currently in Preview] or as a standalone installer. This release includes some updates to DirectX 12, DirectWrite, and DXGI. See What’s New in Windows 10 for developers, build 17134.
VS 2015 Users: The Windows 10 SDK (15063, 16299, 17134) is officially only supported for VS 2017.
C++/WinRT: The new C++/WinRT headers for this Windows SDK are included. You no longer need to make use of the GitHub project (which is now archived) or the NuGet package when using C++/WinRT projections for the latest Windows 10 SDK. See this blog post.
Related: Windows 10 SDK RTM, Windows 10 SDK (November 2015), Windows 10 Anniversary Update SDK, Windows 10 Creators Update SDK, Windows 10 Fall Creators Update SDK