With the Creators Update just around the corner, Windows 10 Insiders on PC are receiving the first cumulative update, KB4016250. The announcement in the Feedback Hub reads:
We need Windows Insiders to help validate the first Cumulative Update to go out for the Windows 10 Creators Update which is set to begin rolling out to customers around the world on April 11th, Today we are releasing a Cumulative Update Build 15063.11 (KB4016250) for PC to Windows Insiders in all rings. This Cumulative Update brings the following fixes:
We fixed an issue where on Surface devices, Bluetooth radio fails to re-enumerate during hibernate/resume.
We fixed an issue with McAfee Enterprise to prevent a system crash when the product driver is installed on build 15060 configured with Device Guard.
As always, please keep sending in feedback via Feedback Hub.
Windows Insider Team
As you can see, KB4016250 doesn't have too much to offer. But as the Windows Insider Team said, this cumulative update is mostly for validation in preparation for the global release of the Windows 10 Creators Update.