The *roff concepts rewrite (http://lists.gnu.org/archive/html/groff/2020-10/msg00013.html) and the ms manual update (http://lists.gnu.org/archive/html/groff/2020-10/msg00165.html) aren't in this rc. Are they targeted for this release?
Also, most of the hyphenation data imported from TeX (see http://savannah.gnu.org/bugs/?57594) was last updated in the 2006-2007 time frame. Is it possible to resynchronize these files for this release? These are both extensive changes, so perhaps it's not appropriate to consider them at this stage. At the same time, it would be a shame if they had to wait for the next go-round, especially all the work Branden has put in to the manuals. The documentation updates, at least, have little chance of breaking anything. The hyphenation data updates are higher risk but still on the low end.
