A few more (personal) highlights from the release:
* New minor mode 'pixel-scroll-mode' provides smooth pixel-level scrolling.
* The networking code has been reworked so that it's more asynchronous than it was (DNS resolution and TLS negotiation do not block Emacs main thread).
* Emacs no longer prompts about editing a changed file when the file's content is unchanged. Instead of only checking the modification time, Emacs now also checks the file's actual content before prompting the user.
* A new submode of 'html-mode', 'mhtml-mode', is now the default mode for html files. This mode handles indentation, fontification, and commenting for embedded JavaScript and CSS.
* Improved CSS mode
* Intercepting hotkeys on Windows 7 and later now works better.