A new Windows 10 Redstone 3 build 16183.1004 details appear online. The new build was compiled on April 21, 2017.
Recently, Microsoft released Creators Update for PC and Mobile users. The new Windows 10 Creators Update brings new features and improvements over Anniversary Update.
However, for Windows 10 Mobile users, the Creators Update is available for only selected mobile devices.
This new build 10.0.16183.1004 (rs_prerelease.170421-1736) is expected to release to end users on April 28.