Update: RC4 will be tagged approximately 12 hours later, on Friday November 13th instead of the 12th, due to an automated test backlog on November 12.
In preparation for the scheduled release of Drupal 8.0.0 on Thursday, November 19, we will create the final release candidate for Drupal 8.0.x, Drupal 8.0.0-rc4, on Friday, November 13. We have added this release candidate in addition to the scheduled release windows to provide a final testing target for changes during the RC phase. (Unlike other release candidates, this release window will not include a 24-hour code freeze.) Plan to help test this final release candidate for bugs and regressions during the final week before 8.0.0's release!
Following RC4, we will further restrict the patches we commit to severe bugs or regressions and documentation fixes only, at committer discretion. So, if you have any allowed RC changes underway, plan to complete them by November 13.
There will not be a separate release candidate on November 18. (The November 19 release date is an extension of the November 18 release window.)