Wotlk.. Priests the new mages..? Follow

Hi all. I'll start by saying that first of all I've not read much about the upcoming expansion, so I could be wrong with what I'm thinking, but it seems to me that most of the enemies we'll be facing will be undead? So this means that shackle will be greatly wanted in instances and groups. Also undead mobs cant be sheeped as you all know, so surley this is going to mean that all of a sudden priests will be wanted over the mages for a change?
Like I say I could be wrong, I've not really done much research, just thought I'd run it by you guys who probably know a lot more then me. But this could mean that all shadow priests will finalyy be happy and feel wanted instead of getting "no thx, need mage for cc thx" :)