Some extra photos to go into the first post, after reading some comments and questions.
I also wanted to add (since I forgot to mention it), how surprised I was to get this set. I was told that they were sending the Breakout Battle set and one other, but I was expecting the Autobot 5-pack or the Leader 2-pack, since they are the other ones that have been shown by Hasbro at BotCon and SDCC... and should be out before this set. So it was like Christmas for me, getting a surprise toy "wrapped up" in a box. (along with a Construct-Bots toy that I didn't yet have either - very, very grateful... and I want to make sure I earn them)
The robot face is a modified sculpt, with a face-plate (right) instead of the mouth version on the First Edition toy (left).
Some Optimus trucks that the MP-10 trailer can now plug into.
Anniversary Optimus (MP-1 Convoy mould) from 2004. The cab is a bit too big though, which can be seen in the next photo.
MP-1B ... Black & silver. As noted above, the cab is so big, the trailer ends up sitting on its back wheels because the front end is sitting upwards.
It also plugs into the Leader class TF4 Optimus.
The cab has a longer proportions to the First Edition, but is smaller, so probably looks better in scale to the trailer.
Bling overload! (Target Silver Knight DLX TF3 Optimus)
A little out of scale - TF4 Voyager Optimus.
It actually does... but I wasn't going to transform one to show it in truck mode. Maybe I should keep more of my toys in different modes, if they are the same mould.