As a big dwarf fan (a big fan of dwarfs, not a fan of big dwarfs) I'm not a fan of Duergar but I agree that they ought to be represented in the game. If we have dark elves, then dark dwarfs should be featured.
It would also be hilarious to see Dark Sun halflings (maybe on holiday or the victim of the trans-dimensional mind-flayer doo-dads), but I'm not holding my breath on that one.
