No CC is needed in any of the WOTLK instances, regular or heroics. You won't really need hex either, I don't recall using it once in any instance and I've run 3-4 of the heroics on beta.

A tank however imo is going to be very useful, the mobs hit very hard and you may even want a healer spec'd character. Most of the boss fights are not tank'n'spank but do require mobility, movement, and target switching so a shaman team is still very good. Cloth teams or a tankless team is going to have harder times, imo (talking mostly heroics).