You're talking about that short video clip of a very rough animatic looking version of Prime that only showed his transformation from the waist up...correct?
Sorry...don't have it
Awwww. Yeah I'm pretty sure it only showed him from the waist up. Like I said, he wasn't completely rendered. He had no details and was completely red. Ah well.
I'm still looking, but if I find it, I'll post it here.