What I am intersted in how close is it really to 10 man ICC which the developers are comparing it to. The developers said the MoP heroics was WotLK heroic difficulty which I know a number of players find that hard to believe. The developers said the DS heroics was supposed to be WotLK difficulty and I found them to be close while in MoP the developers seem to have loss their sense of difficulty over the years.
In the relevant gear 10 man ICC was not that easy ignoring the first four bosses which was easy on 25 man to begin with and the raid was slightly tuned lower for the gear to allow more flexibility is less favorable group comps along with mechanics that was more forging to a 10 man group than it was to 25 man.