Here is a link to an image of the Argosy Cab-Over that is rumored to be featured in the new Transformers 4. There is speculation as to the character this vehicle will portray, such as Nemesis Prime or possibly Ultra Magnus. Again, the character is pure speculation at this point. However, take a look at the truck and tell me what you think.
http://www.google.com/imgres?imgurl=http://images.freshnessmag.com/wp-content/uploads/2013/07/2014-freightliner-argosy-cab-over-truck-transformer-4-movie-michael-bay-02-570x570.jpg&imgrefurl=http://www.freshnessmag.com/2013/07/01/transformers-4-2014-freightliner-argosy-cab-over-truck/&h=570&w=570&sz=74&tbnid=3iHWHb1rr98biM:&tbnh=90&tbnw=90&zoom=1&usg=__wAf8gAMZR63QIWH_9NGJ22LXc0k=&docid=mDFbhXkPhT0-hM&sa=X&ei=-H4iUsbpMYXFsATEnoCACQ&ved=0CCsQ9QEwAA&dur=855