Diablo III Morlu Caster Details and Artwork

The eagle-eyed fellows over at the Diablo Wiki have uncovered some details and artwork for a previously unrevealed Diablo III monster - the Morlu Caster. The monster was apparently part of a hidden reveal at BlizzCon 2009, but it wasn't until today that sleuthing efforts paid off:
The Morlu Caster has only been seen in concept art and in the Monk's cinematic movie, so they are known more by potential than by actuality. The monster is definitely a humanoid and by apparently looks like a higher level version of the various Dark Cultist mages. Morlu is the monster type, and "Caster" is his role/occupation. We might see "Morlu Warriors" or some other Morlu type units -- or this particular demonic mage might be a one-off who has a fancier name than most.

Since they are undead elite warriors (reading the Sin War Trology), we know these will likely either be just elite troops, or perhaps bosses, the lot of them.

Morlu Casters are unknown in the game, so their behavior can only be predicted by how this one behaves in the Monk cinematic movie. There it launches a Fireball, which seems a very probable skill. Less likely is the ability to leap high into the sky and vanish, leaving behind a barrage of falling Meteor Storm, but such a power is not out of the question for a late game enemy.

That the monster will wear a robed disguise and pretend to be your friend seems highly unlikely, though.