I doubt it. He was a Cyrodiilic Vampire. But it is possible, since his victim, Movarth, appeared in the game.
It's things like this that show Beth do care about the lore they wrote in past games
Okay, no idea what mumbochumvo is, but it definitely sounds as if there will be cape/cloak physics. Now if only we knew whether or not they'll actually be equipable items or just be attached to armor. Considering the popular demand, they would be smart to implement them as equipable items.
It's very possible as mods use an unused item slot present in the game to add them as seperate items, no reason why Beth will not do it the same way