WordPress 4.8.1 release delayed by one day

The 4.8.1 release was due out today (August 1st), however a performance problem was raised during release preparations. Specifically, the ticket in question is #35293 and its problematic commit on the 4.8 branch has now been reverted, while the changes remain on trunk. A performance fix is pending in #41501, and it may be part of a subsequent 4.8.2 minor release.

We’ve re-scheduled the 4.8.1 release to occur after the core dev chat tomorrow, at August 2nd, 21:00 UTC.

In the mean time, please continue testing the release. A new 4.8.1-RC2 package (ZIP) has been published for you to triple check on your test environments. For more information on testing, see Beta Testing. The 4.8.1-RC2 release contains 29 maintenance fixes and enhancements since 4.8.0, chief among them are fixes to the rich Text widget and the introduction of the Custom HTML widget. For a full list of changes in the release, consult the tickets closed and the changesets committed.