Microsoft is now rolling out a new Windows 10 SDK build 14388 Preview for developers. You need Windows 10 Insider Build 14388 or greater for latest SDK. New SDK Build 14388 Preview contains minor bug fixes and under development changes.
From Insider blog:
This is still a pre-release build of the SDK. While the EULA does state this is an RTM release, it is not. This release does not have a go-live license. Apps built with this SDK will not be allowed to be on-boarded to the store. The Preview SDK is a pre-release and cannot be used in a production environment. Please only install the SDK on your test machine. The Preview SDK can be downloaded from developer section on Windows Insider.