So if cc is going to be required...

Not every pull is going to require crowd control, but there will be pulls that require crowd control, which isn't really the case today. Once you overgear content you overgear it, and you can take shortcuts.

We're going to make sure warriors have reasonable crowd control. Redesigning Intimidating Shout is a likely candidate. Death knights may need something more reliable depending on how they shake out with the resource changes. We're making some other adjustments here and there, but for the most part every other class has something they can do.

Q u o t e:
Is this statement meant to imply that tanks will be the ones that have to CC?

There are exceptions of course and it depends a lot on your group composition and the skill of your players, but generally we assume that CC is something for which the dps players in the group are responsible.

Under that model, Mind Control works fine for priest crowd control since the healers have plenty to do already. Mind Control won't work on every type of target, but many types of crowd control have a target type limitation. We think having to approach a pull differently depending on your comp is one of those things that makes classes feel distinct from each other. It's hard to put together a 5-player dungeon group or a 10-player raid in Cataclysm that is totally helpless with regard to crowd control. If you don't like approaching encounters as puzzles to be solved, and / or really aren't interested in dungeons being challenging, then stick with normal dungeons or wait until you outgear the heroics. :)