With the resent lore board, and the reveal of the Obsidian Destroyers, it made me think...
The Tol'vir were created to be mechanical / whatever type guardians, just like the gnomes and the dwarves, to watch over titan constructs.
We know there were Tol'vir in Uldum and Ulduar.
What if, the Tol'vir in Ulduar that weren't wiped out actually succumbed to the curse of flesh? What if those cats that are following around "Crazy Cat Lady" are actually the only remaining Tol'vir in existence (other than the ones soon to be revealed in Uldum)
(I also posted this on main WoW forums)