[jpfr]

This is the branch to watch for guile-elisp: http://git.savannah.gnu.org/cgit/guile.git/log/?h=wip-elisp

Last thing I heard was that Guile-Elisp (and by consequence Guile-Emacs) is working, but very slow. That can be fixed but requires work. Also, Emacs internally uses a different string representation from Guile. This makes the transition between languages tough and some more glue is required.

IMHO Guile-Emacs is "nearly there". I.e. with just a little more work it could have enough momentum and attract developers to be on the trajectory of becoming the default elisp implementation in the long term.

Having the new Guile 2.2 VM drive Emacs would definitely improve things. And the C-codebase could become considerably smaller and cleaner.