Underdark Supplement for 4e?!?

[arscott]

Sprigans and Duergar will probably show up as playable options ala the bladeling in Manual of the Planes.

The new SRD seems to imply that the Dreugar is detailed in the back of the MM2

 

[Jhaelen]

Yes, they can.

That's bad. They should only be available after checking the houserule option. Otherwise it will lead to players believing they're entitled to be allowed to play them.