It is an in hand image of Optimus Prime posed in his robot mode.
To those unaware, we know from a previous image (shown below) that the alternate mode is very inspired by the truck in the G1 cartoon. We also know he has a 35 step conversion and that the figure comes with the "San Francisco Bridge" backdrop, which is where he meets Bumblebee at the end at the end of the film.
This figure will be coming out mid spring next this year.
