The Guile team are writing an implementation of Elisp that targets the Guile back end, so that the two languages have a common runtime. The idea is then that:

The Guile team are writing an implementation of Elisp that targets the Guile back end, so that the two languages have a common runtime. The idea is then that: 1. Elisp can be made faster; 2. Emacs scripting can be done in both Guile and Elisp.