Windows 10 build 17117 is now going through internal testing. The new Windows 10 Spring Update build 17117 (10.0.17117.1 rs4_prerelease.180306-1414) was compiled on March 06, 2018. Windows Insider members might receive another build this week.
Windows 10 Spring Update preview build 17115 is now available for Insiders. In addition, the insider preview build includes new privacy settings with a new design to help customers make focused choices about their privacy and offers two new settings for Inking & Typing and Find my device.
The ISO files for Windows 10 build 17115 are also now available for download. You can download it from the link below.