Fast ring insiders are now receiving Maps app update. The latest official Maps preview version is 5.1608.2117.0. The main feature of the new Maps update is the addition of long-awaited Inking options. Windows Maps can now display the distance between two points from any line drawn with Inking. You can select a different color from Windows Ink Toolbar.
Windows Ink Toolbar comes with support for touch writing, eraser and pen. This update is available for Windows Insider members running build 14393.10 on their PC. Soon this update will be released to everyone. Insiders can download it from below link.