S250 has posted some ROTF concept art at TFW2005. These art pieces are of the combined form of Optimus Prime and Jetfire, as well as Mixmaster's robot mode.

The artwork of the Prime/Jetfire form shows us a good look at how the two meld together as Jetfire wraps around Prime to bulk him up with exaggerated armor and enhanced weaponry.  This first pic shows them from the front, this second pic shows them from the back, and this third pic shows them standing before the fallen body (corpse?) of Starscream.

The Mixmaster artwork shows him in a rather interesting position, with his main body near the ground and his  large shields in place. Here is the pic.

Also, S250 has posted artwork of Scrapper's robot form. In this pic, he's in a position that shows he's ready to face his opponent. See the pic here.

All these pieces of artwork were orginally found at TFG2.com.


REVENGE IS COMING
6.24.09