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) 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.
Samples: The DirectX-Graphics-Samples repository of DirectX 12 samples has been updated to use the Windows 10 SDK (17134). This includes samples for the recently announced DirectX Raytracing API as well. Windows-universal-samples and Xbox-ATG-Samples also now use the Windows 10 SDK (17134)
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, Windows 10 October 2018 Update SDK, Windows 10 May 2019 Update SDK