Shroomy
Adventurer
The big question these days, I think, is: where are the Dabus?
As far as I remember there's no mention to it on 4E. The closest things are the keepers of Gloomwrought.
I was reading my copy of Kingdom of the Ghouls last night; during the adventure, the PCs visit Sigil. In the section of the adventure describing it, their are mentions of the dabus. It doesn't go into any great detail about them other than that they serve the Lady of Pain, but my guess is that you'll see more of them in the DMG2.