Some of the new hunter pets supposedly can be setup far better as "tanks" than before (such as a gorilla). One would think an entire group of them would do quite well.

Personally, I'd stick with a diverse group, in case they gimp the heck out of a group all of one class. But now that more classes will be able to CC than before, there'll be more options (Balance druids and roots, Shaman and Hex, Hunters and the distance freezing shot).