Having ELPA built in is really nice. If I'd had a package manager back when I was first learning Emacs, I think I would have resented it a lot less. And even now, having it available without fiddling with anything will be such a nicety.

I'm looking forward to trying ELPA (my .emacs.d is so full of stuff I've not yet gotten around to trying it).

bi-di support is also really nice, I've been copypasting into other programs until now.

Also always nice to get a new org-mode version (though I'm never quite sure whether using org makes me more productive, or whether playing with new org features makes me procrastinate more).

Favourite feature that makes you go O_o : "`nato-region' converts text to NATO phonetic alphabet."