July 29th started the official roll-out of Windows 10 and, for Windows Insiders, was pretty much “Wednesday”. We already had everything of relevance by Monday on the OS side of things, and not even a security patch landed in our Windows Update queue. It was not the only thing that Microsoft launched today, though. While Visual Studio 2015 was released last week, it said that it was not compatible with pre-10240 SDKs and would delete them during the installation process and you will be unable to develop SDK apps until the one for 10240 launches on July 29th.
So, coincident with the OS release, Microsoft finally published the 10240 Windows SDK. Now, if you run Visual Studio 2015's installer, it will install the new SDK directly. You do not need to download it from a secondary source. These headers and libraries are placed in the “Windows Kits” folder of your 32-bit Program Files directory… ironically, without deleting the previous SDKs that it threatened to, when run before July 29th. Go figure.
Also, even though DirectX 12 has been in the Windows SDK for quite some time, Microsoft has, also, finally released code examples and they put them on their GitHub page. These samples teach you how to do things like draw a triangle, manage DirectX 11-era contexts alongside DirectX 12 ones in your application, and create an n-body gravity simulation. They welcome pull requests for fixes, although they might appreciate new samples as well.