All three specs of the warlock class have been reworked -- and yet there are still familiar things lying around. We can still Fear and Banish and Enslave Demon. We still have Unending Breath. We still sacrifice our health to get mana back or to dump threat. We still have pets and guardians to summon.
But while everyone's still focused on the new things -- the resource changes or the new abilities -- some familiar things are different. Same name, even same icon as before, but they're actually a little different. Some are obvious and important, and some you won't notice or care about.
All the same, I think you should know a few of the smaller changes to our class abilities.