Rob's Room: Genndy Tartakovsky's Uproduced Superman Concept Art for DC Nation

Strange... I don't recall seeing this before!
Genndy Tartakovsky's Uproduced Superman Concept Art for DC Nation:

Genndy Tartakovsky, Justin Thompson and I were very excited to do our take on an animated Superman but  unfortunately it was pulled from us just as we were starting.

-via Scott Willis