Well the new customization options are so far more funny than amazing, but I'm really digging the new models. Kael'Thas is up for another setback, Kel'Thuzad is back and so is Vashj with a super awesome undead naga look. I'm very very glad she is back cause out of all WarCraft characters she got the worst treament. She would have been the perfect leader for a playable Naga faction but instead she got killed of in a raid people only did to unlock the Hyjal fight.
Also we have a model of the Jailor and he doesn't look like Arthas. Will that end the theories already?
EDIT: By new customization options I meant the ones on wowhead. Still looking at twitter.