Here is what the official blog says:

This is an important milestone as we progress toward the WordPress 5.2 release date. “Release Candidate” means that the new version is ready for release, but with millions of users and thousands of plugins and themes, it’s possible something was missed. WordPress 5.2 is scheduled to be released on Tuesday, May 7, but we need your help to get there—if you haven’t tried 5.2 yet, now is the time!

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