Microsoft released a new patch for Windows 10. Like all Windows 10 patches, you get to install it whether you want to, and it'll be automatically implemented, likely overnight.
"Update for Windows Technical Preview April Update for x64-based systems (KB3055415)" forces a reboot. Inside Windows, you get this illuminating notice:
Install this update to resolve issues in Windows. For a complete listing of the issues that are included in this update, see the associated Microsoft Knowledge Base article for more information. After you install this item, you may have to restart your computer.
Of course, there's no Knowledge Base article. Even Windows guru @GabeAul hasn't tweeted anything about it yet.
Man, I hope they don't continue this mushroom patching in the final version.
Update: Microsoft has posted KB 3055415.