The Dinobots will finally be making their long-awaited big screen debut in Transformers: Age of Extinction, and today we get our first look at Dinobots leader Grimlock courtesy of a leaked piece of promotional Toy artwork. This is reportedly licensing artwork from the AC Toys catalog, and other images give us a better look at Optimus Prime, whom we first saw in a poster a few weeks back. With this comes a set video that claims to contain the roar of Grimlock as innocent bystanders run down the street in Hong Kong. Check out the new Optimus, Bumblebee and Grimlock as they will appear in this anticipated sequel summer 2014. It should be noted that this is not confirmed as official artwork, but AC Toys has built a strong reputation for only bringing authentic pieces of promo art to the forefront. We've included the poster that leaked last week for comparisons.