Note this article was written last year and I'm guessing a lot of new stuff has been added since then.
Either way, the article does not mention its publishing date anywhere, which is rather unfortunate for a medium like the internet, where text is forever.
The article implies it shouldn't have been:
> At the time of this writing Emacs 24.4 is in feature freeze; no major changes will get in, but the list of changes you see below is not set in stone – but it almost never changes much.