I just found confirmation that the
Constructicons will be in Transformers 2. See here:
http://vimeo.com/4719348 In the TV series, the Constructicons combine to form Devastator-- a massive, giant (even for a Transformer) implement of destruction. You've probably seen him in some of the clips for the movie-- he shows up briefly in the one I linked you to.
I'm so excited!!!! :D