Microsoft is now testing Windows 10 build 17106 internally. The new Windows 10 v1803 Redstone 4 build 17106 (10.0.17106.1000 rs4_prerelease.180216-1518) was compiled on Fab 16, 2018.
Windows 10 preview build 17101 is now available for Insiders. The latest insider preview build adds Emoji search for more languages, UWP File System Access changes and a new Ultimate Performance power scheme. in addition, there are various bug fixes and improvements.
The ISO files for Windows 10 build 17101 are also now available for download. You can download it from the link below.