Presenting the Platinum Edition Evasion Mode Optimus Prime from the Transformers Age of Extinction Toyline.This Voyager class Optimus Prime is part of a two-pack Platinum Edition that includes a just as Chromed up Voyager edition of Grimlock.
From the trailers and the blister pack, we can already surmise that the Autobots in the Age of Extinction movie are going through the break-up of the "Human Alliance", and as such have transmorphed into other vehicles in an attempt to stay as incognito as possible - specifically "junkers" (In the same way that Bumblebee kept a low profile in the first movie by transforming into a beat-up 1977 Chevrolet Camaro).
Optimus Prime has chosen to abandon his 1997 Peterbuilt body sported in the Transformers, ROTF and DOTM movies, sample of which you can see here (Jetwing), here(Striker), here (Modified Striker) and here (JetPower Upgrade), in favor of a 1973 Marmon Cab-Over-Engine which is quite similar to the Freightliner Cab-Over-Engine Class 8 truck he transforms into in the original cartoon series (Later on in the movie, Optimus Prime adopts the appearance of a Western Star semi-truck that you can see here).