As far as Chelsith named go, you'll be able to mez-kill them if you can safely pull them. I do it all the time with my illusionist and am looking forward to trying it out with a troub when I get him to 80 (long way to go though).
They did add some new wrinkles to those named, however. They now have a ranged attack that they hit you with on pull...not that it matters much...if they get mezzed, they're dead.
