Windows 10 build 18312.1001

Windows 10 version 1903 build 18312 was released on 2019-01-09 to Insiders in the Fast Ring.

New Features

 * Reserved storage, allowing you to reserve a few gigabytes of disk space for updates.
 * A new and simplified UI for the Reset this PC feature.
 * Windows Subsystem for Linux (WSL) improvements in the command line.