Christmas Mural Re-Visited

The new ShoWest Footage reveals confirmation of a leak from last Christmas that showed a damaged mural and no idea what behind it. As seen below, it is clearly the same mural. Based on the footage, it appears this is occurring at Petra, Jordan. We know the Decepticons are looking for the AllSpark fragment and Sun Harvester. What could the Autobots be searching for? Thanks to Katie for putting it together. To view the images of what is behind that mural, click here. Early guesses were the Fallen but the images don't match and besides he is in another dimension.