Speaking of TF alt modes, YouTuber Mendelhall512 posted the below video of Paramount Pictures crew hauling off his vehicles, writing "Paramount rented my 1969 GTO & 1965 GTO to be used in the new Transformers 4 film code named E74. Look out for the cars next summer when the movie comes out as they will be Mark Wahlberg's very own Goats in the story line." Since it seems that Wahlberg is playing a mechanic, it seems a Hollywood character rule is all mechanics prefer to work on old muscle machines so it fits the character. Its also possible these are alt modes but nothing yet to indicate that.
A Paramount truck was also busy hauling other cars. Instagram's iamjwest posted an image of one carrying what appears to be a concept Cadillac Cien, concept Buick Velite, white Ferrari, and blue Aston Martin while kingmyreee took a video of it. Thanks to Sam N. for the link. Again no indication if TF alt modes but concept cars usually tend to be. The idea of the Stunticons being in the film is starting to not seem so far fetched. Kingmyree's note mentioned Tyrese being on set but considering the entire human cast of the previous movies have been jettisoned, I am not going to believe it until see a set picture backing it up.