Well, I'm going to assume that in Cataclysm you will not have to CC more than 2 mobs at a time in 5-mans. My plan is a 3-button approach. Since I dont use Focus with any of my teams, I will be utilizing it for CC as such:

Tank targets 1st mob to be CC'd and I hit Ctrl+F1 which my Mage will have this macro'd to that function:

/assist party1
/focus target

Tank targets 2nd mob to be CC'd and I hit Ctrl+F2 which my Shaman will have the same macro set for that function.

Then before pull, I will hit Ctrl+F3 which will have the following macros tied to it on the CC toons:

/cast target=focus sheep

/cast target=focus hex

BAM!