Above and below anthology

David Anthony Durham posted an interesting bit of news for readers of short-fiction anthologies. He was asked by Jeff and Ann VanderMeer to write a story that fits this theme :

ABOVE AND BELOW: FLOATING WORLDS & SUNKEN CITIES, edited by Ann & Jeff VanderMeer - Whether it’s myths of kingdoms in the sky or of strange subterranean realms, exotic and fantastical places have captured readers imaginations for centuries. From Jules Verne and Edgar Allen Poe to modern times, that which waits above or below has enticed readers with its promise of mystery, adventure, dark beauty, horror, and fantasy. Join some of today’s top writers as they take you to the heights, and down into the depths.

The writers already on board include : Alan Campbell, Jay Lake, Caitlin R. Kiernan, Cherie Priest, N.K. Jemisin, Alastair Reynolds, Joe R. Lansdale, and Steven Erickson.

Sounds promising, but no date so far.