Recently I took a look at the FCDB 2013 Marvel Universe comic. It had film comic stories from Hulk and the Agents of S.M.A.S.H. and Avengers Assemble, but the art style in the latter was a bit different. Some of the designs (for Thor, Hulk, and Hawkeye) looked different. This might have been test footage shown at San Diego Comic Con earlier, but what exactly was that?