There's been periodic interest here in the long-discussed project of rebasing Emacs's runtime on top of the Guile VM, rather than its current custom VM. Eg.: https://news.ycombinator.com/item?id=8449488, https://news.ycombinator.com/item?id=8338602
This article has a concrete set of TODOs for getting that to work, which I suspect appeals to people interested in that general project, but frustrated that it seems to be moving glacially.
This is about the Emacs internals, though. Not (for the moment) necessarily of interest to someone just using Emacs, or contemplating doing so.
Any particular reason this is front-page news? I'm not currently an Emacs user, but I've been considering it. Maybe I'm missing something notable buried in this list.