The Gnomon Workshop, part of the 3D and VFX school Gnomon, will release a set of 4 DVDs about concept design by Feng Zhu. He joined the Art Department for Star Wars Episode 3 where he is working in designing environments, vehicles and props.
The four titles are:
You can see more of his art at his website and there was a small feature on him that ran on the official Star Wars site:
In related news the official Star Wars website posted two questions about the concept design and animatics for Star Wars prequels:
DVD news originally spotted on CGTalk.com.