Some early WIN10 v1903 resources are noted below as it was officially released May 21, 2019

https://www.windowscentral.com/how-get-windows-10-may-2019-update-your-pc-soon-possible

https://techcommunity.microsoft.com/t5/Windows-IT-Pro-Blog/What-s-new-for-IT-pros-in-Windows-10-version-1903/ba-p/622024

Assuming there aren’t any major last-minute bugs, Microsoft is expected to start rolling out the Windows 10 May 2019 Update (version 1903) on May 21, 2019. This is the seventh feature update available for compatible devices that delivers a slew of improvements and several new features to enhance the overall experience.

While this new version won’t significantly change the way you use Windows 10, it does introduce a list of incremental changes and new features, such as a true system light theme and “Reserved Storage” to minimize the impact of update installation.

The May 2019 Update also introduces “Windows Sandbox” to securely run untrusted apps without putting your device at risk. “Recommended Troubleshooting” will help keep your system running smoothly by applying fixes to common problems automatically. Windows 10 Home users will finally be able to pause quality updates. Search once again becomes an independent feature, and it can now search your entire device. You can now let the system adjust active hours automatically, and much more.