While a set-in-stone release schedule doesn't exist, there is _a lot_ of development activity (emacs-devel is a very busy mailing list). 99.9% of the time it's

While a set-in-stone release schedule doesn't exist, there is _a lot_ of development activity (emacs-devel is a very busy mailing list). 99.9% of the time it's safe to use the bleeding edge head of the repository if you want to use the latest stuff.