Microsoft has released a new Windows 10 insider preview build as well a new Windows 10 SDK preview build:

Windows 10 Insider Preview Build 18305
Windows 10 SDK Preview Build 18298 available now!

Announcing Windows 10 Insider Preview Build 18305

Hello Windows Insiders, today we are releasing Windows 10 Insider Preview Build 18305 (19H1) to Windows Insiders in the Fast ring.

REMINDER: As is normal with builds early in the development cycle, builds may contain bugs that might be painful for some. If this makes you uncomfortable, you may want to consider switching to the Slow ring. Slow ring builds will continue to be higher quality.

If you are looking for a complete look at what build is in which Insider ring – head on over to Flight Hub. You can also check out the rest of our documentation here including a complete list of new features and updates that have gone out as part of Insider flights for the current development cycle (which currently is 19H1).

Note: This will be our last major WIP build of 2018, although we may send out a cumulative update in the coming days. Happy holidays!

Read full article @ Windows Team Blog

Windows 10 SDK Preview Build 18298 available now!

Today, we released a new Windows 10 Preview Build of the SDK to be used in conjunction with Windows 10 Insider Preview (Build 18298 or greater). The Preview SDK Build 18298 contains bug fixes and under development changes to the API surface area.

The Preview SDK 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.

Read full article @ Windows Team Blog