On Tor.com, there is a cover reveal for the first three episodes of Tremontaine, the serialised prequel to Ellen Kushner’s Riverside novels, to be published by Serial Box Publishing beginning at the end of October 2015. It is written by written by Ellen Kushner, Alaya Dawn Johnson, Malinda Lo, Joel Derfner, Racheline Maltese, and Patty Bryant, with covers by me.
The Tor.com post also has lots of behind-the-scenes pictures, but here is a quick time-lapse of the sketching process to whet your appetite (if I can get the video to work):
Kathleen Jennings 
This idea, and these covers, are so lovely. Congrats on the project, and on keeping it a secret for so long.
Thank you!
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That is insanely cool!