https://www.techradar.com/news/windows-10-april-update-could-be-releasing-may-8

A new leak suggests that the Windows 10 April Update, which was formerly known as both the Spring Creators Update and Red Stone 4, is set to land on May 8, which makes the recent name change a bit unfortunate.

The update was previously delayed due to a critical bug being found, and now an internal memo from a Chinese retail vendor, which was posted on Twitter by a user named FaiKee who took it from a Chinese website, suggests that ‘Windows RS4’ will be released in China on May 9, which would be May 8 in the US and UK.