Ещё один проект хотят переписать на rust
http://www.phoronix.com/scan.php?page=news_item&px=Remacs-Rust-Emacs
Да, форк.
Porting to Rust gives us lots of opportunities. We can leverage the rapidly-growing crate ecosystem. We can drop support legacy compilers and platforms (looking at you, MS-DOS). We can add docstrings and unit tests to core functions that aren’t exposed to elisp. It’s also a ton of fun. Remacs is based on Emacs 25.2.