The first release candidate for what will be the 26.2 release of Emacs
(the extensible text editor) is available at

https://alpha.gnu.org/gnu/emacs/pretest/emacs-26.2-rc1.tar.xz

Is there a branch or a tag on the repository reflecting this version? I couldn't find any, sorry if I missed it.

I use tags or branches to build the corresponding docker images.

Thanks,

Philippe