I wouldn't mind a new Theodora Goss collection :)
Aliette de Bodard
Mary Robinette Kowal
I'd second Aliette de Bodard and Ken Liu. I'd add Ian McHugh.
And Kaaron Warren has two short story collections that I'm aware of--The Grinding House (published by CSFG) and Dead Sea Fruit (published by Ticonderoga).
Mary Robinette Kowal had a small collection of stories via Subterranean Press called Scenting the Dark and Other Stories. Great stuff.
Unfortunately it got trade reviews, which means it's not easy to reprint it, and get into the library channels. A whole new collection would have to be created, instead . . .
Seconding the new Theodora Goss collection.