Microsoft Windows 10 19H1 (1903) – Available through Microsoft Volume Licensing Service Center

It’s now available the new Windows 10 v1903 or 19H1 at Microsoft Volume Licensing Service Center website.
Here you can download all the new enterprise versions ISOS (x86; x64; ARM).

Window Central website has a full changelog for this version:
Windows Central - Windows 10 19H1: The complete changelog