We knew that Wrath was going to bring new emotes (and some of them were even suggested by players), and now Blizzard has posted the full list, complete with which emotes have animations and voices, and none or both. The /cower is the most hilarious one I've seen so far -- the Night Elf /cower is just terrific. And some of these are old and just not very well known -- /nosepick, I'm pretty sure, has been in there since the beginning, but I don't remember ever seeing anyone use it in game.
Unfortunately, they don't mark which are new and which aren't, but I believe /incoming is a new one. I've never tried out /sing or /ding. and /doh looks new to me as well. But odds are that there are at least a few you haven't tried yet, and we do know that lots of the animations are new for sure.
So get in there and try out some emoting -- if there's an especially funny one you find, let us know for sure.
Update: Commenter Jason M. nabbed this cache of the page from the Wayback machine so we can see what's old and new for sure. Thanks!