Microsoft has released a new Windows 10 Preview Build of the SDK and the Mobile Emulator to be used in conjunction with Windows 10 Insider Preview

The Preview SDK Build 16278 contains bug fixes and under development changes to the API surface area.

The Preview SDK and Mobile Emulator can be downloaded from developer section on Windows Insider.

For feedback and updates to the known issues, please see the developer forum. For new developer feature requests, head over to our Windows Platform UserVoice.

  Windows 10 SDK Preview Build 16278 and Mobile Emulator Build 15240 Released