An image posted by JoBlo might be the first look at Grimlock's dinobot alt mode. In the picture it seems Optimus Prime is riding Grimlock like a horse while holding a sword and shield. The image, assuming inspired by movie plans, does look pretty awesome. The source is unknown so unable to confirm if its officially related to Transformers: Age of Extinction or just creative fan art. Thanks to Feris O. for the heads-up.