Microsoft have officially announced the 19H1 /1903 update for Windows 10 will be called the Windows 10 May 2019 Update and be available from next week. The update will go out to the release preview ring next week (build 18362), which marks a change to last year where Microsoft skipped release preview and missed an update bug that caused data deletion. Microsoft have said that build 18362 will stays in Release Preview for a longer period of time than before so they can gather data before pushing and test the update process before it rolls out.
The other change to this rollout is that Windows will alert you about the new update and then it will be up to the use to initiate the download and install rather than Windows automatically downloading and installing as it has with previous updates. Only when the installed version gets close to the end of service will it force the machine to update.
There will be a new option in the Windows Update setting to Download and install the feature update when it’s available for your machine, but in the mean time you will continue to get updates to your current version of Windows.
Here is my hands on look at the changes to the 1903 / Windows 10 May 2019 update: