I admit: I don't play demonology. As much as I'm a maestro at affliction, corruption gliding from my fingertips, I just fall apart when it comes to mastering the demonic arts like Illidan. So on the one hand, I don't really know where demonology is supposed to be heading in Mists of Pandaria, apart from Metamorphosis being just more awesome now.
On the other hand, I don't have the old habits to rewrite over. I'm new blood, much like the revamp of warlocks in Mists will certainly attract people who don't play the class now. I'm perfect for testing how easy the spec is to pick up for newbies.
I can tell you this: I was having fun on beta demonology. All you have to do is Demonic Leap with me beyond the break.