No Beasts were shown. Instead people saw Optimus, Bumblebee and Arcee. Arcee is said to look like G1 Arcee, Optimus is said to look like he did in the Bumblebee movie and Bumblebee looks like Bayverse Bumblebee (same car mode, same face, same visual cues). The footage shows Arcee hanging on the the side of a moving car as she is about to take shots with her gun. Anthony Ramos was seen in a car as well. No Dialogue was uttered, it was only 12 seconds of shots among a sizzle reel.
This description was lifted from The John Campea Show which discussed first hand what the group saw.
Usually, if a trailer is shown at an event, then it will likely be shown in a week or two to the public BUT if it is a sizzle reel like the one described, then it will not be made available for anyone else to see, ever.