IMAGE REMOVED DUE TO HISSY FIT
And here it is. As far as we know, Bumblebee's car mode is not a VW bug, but a modified Camaro. Also unknown is how many Transformers will exist as actual props instead of pure CGI models. The question of mass-shifting has also yet to be resolved publicly[as far as I know]. For those unaware, mass-shifting refers to the fact that certain Transformers 'grow' or 'shrink' during transformation, the biggest examples being Soundwave [cassette player to huge robot] and Megatron [pistol to huge robot].
A teaser poster has been released at the official site, with a teaser trailer due to hit the net July 4th and theaters July 7th.