OK. These toys are supposed to represent the Cybertronian forms of the Transformers. Prime in a Cybertronian truck of some kind. Starscream is a Cybertronian jet of some kind. I said it once, but I guess everyone missed it, but these forms will most likely NOT be in the movie. By leaving them out of the movie, they will save a bunch of money, because they will not have to render multiple character models for each Transformer. But Hasbro, being a mutli-gazillion dollar toy company isn't going to pass up a chance to make some more money. Hence we get these toys as well, so all the little kiddies can play "Transformers on Cybertron!!!" I hope this settles some of the diputes on what we're looking at here.
And I circled Prime's wheels in his vehicle mode for those who don't think they exist.