Taken from the MTV Movie Blog interview:
Lorenzo di Bonaventura “We never really talked about that, practically speaking,” he said of the character who might or might not have been known as Broadside, and who Bay has said was simply too expensive to create. “There was some Japanese animated movie we saw where that occurred, and we were like ‘Wow! Look at that thing!’”

So, for what some Transformers fans were hoping for in the second movie still remains to be the problem that it was in the first.
To view the complete interview, click here.