Okay, so we've been hearing this for a while now. The Dance Studio is coming at some point during Wrath, it's just been delayed. There's been no word about that beyond it though. We're not even sure if they have a rough target patch for it. It's just sort of out there, that unanswered question: Dude, where's my feature?
Zarhym spoke out on it again the other day, and while on one level it's more of the same "it's coming when it comes" type of talk we've heard before, he does say that the art team is "hacking away" at it when they aren't faced with more looming deadlines like Ulduar. This is probably the first time that I can recall that we have had someone from the Blizzard team saying that yes, it is being actively worked on.
Now admittedly, this still isn't a release date, and I'm still not expecting it until at least 3.3, but it's out there, which is the good thing. Here's looking forward to the day when I can have my Human Death Knight start dancing the Matt Dance.