The Emacs 27.1 train keeps rolling along with the announcement of the second release candidate. I’ve been using 27.1-RC1 and haven’t encountered any problems so I wasn’t going to bother with RC2 but Álvaro Ramírez just explained to me how to fix the problem I and others are having with yequake. That involves patching frame.c so I’ll probably use RC2 when I do that.
There hasn’t been much discussion on Emacs-devel about RC1 problems so I expect that we’re close to an official release of 27.1.