That's something that we did actively work on and certainly the technology is pretty well in place at this point. We were also hoping to get the dungeons to a point where they were scaling, however we didn't actually end up coming up with a reward scheme that we felt fit correctly.
I think it's important to remember that today, players can go back and do old content by soloing it and they usually do that to get the transmog gear, and I think if they were going to to go back and do it as a true 25-man raid of Black Temple, as an example, they'd would have to feel like they were getting something that was useful for it as well as transmog gear, and we still have to figure out what the right reward scheme for that is.
We don't want it to compete with the new raid in terms of getting you the best possible gear, but at the same time, it has to be worth something. So that's something we haven't really resolved yet, so we won't be seeing scaling raids until sometime in the future.