GNU Emacs 25
Emacs 25 is the latest version, released September 17, 2016.
Where to get
Gtk's Xwidget integration: watch youtube inside Emacs
Better built-in eww, web browser
Experimental Cairo integration
New unicode characters input method
New library: Project (as a subset of Projectile)
Better history of query-replace
New library: seq.el and map.el (replaces dash.el)
Dired: auto-revert buffer on file change
Json, tramp, and more
See the release notes.