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WordPress 5.1 “Betty” was released on February 21, 2019.

WordPress 5.1 will be the first major release of 2019, including PHP version upgrade notices, and block editor improvements.

Release Schedule

December 19, 2018 Trunk is open for business. (Post-5.0)
January 10, 2019 Beta 1 and feature merge deadline.

From this point on, no more commits for any new enhancements or feature requests in this release cycle, only bug fixes and inline documentation. Work can continue on enhancements/feature requests not completed and committed by this point, and can be picked up for commit again at the start of WordPress 5.2.

January 21, 2019 Beta 2
January 29, 2019 Beta 3 and soft string freeze.
February 7, 2019 Release Candidate 1 and hard string freeze.
February 20, 2019 Dry run for release of WordPress 5.1 and 24 hour code freeze.
February 21, 2019 Target date for release of WordPress 5.1.

Contributing

To get involved in WordPress core development, head on over to Trac and pick a 5.1 ticket. Need help? Check out the Core Contributor Handbook. Get your patches done and submitted as soon as possible, then help find people to test the patches and leave feedback on the ticket. Patches for enhancements will not be committed after the dates posted above, so that we can all focus on squashing bugs and  deliver the most bug-free WordPress ever. If you want to dive deeper into 5.1, development is discussed at a weekly meeting in the #core Slack channel and occurs next at Wednesday at 21:00 UTC. Wish us luck!