I went back and forth with a friend on this so many times. He's convinced it's the Enterprise crashing, but ANY fan can clearly see it's not. The nacelles on this ship (which I think is the Vengeance) are so much farther apart than the Enterprise's and plus they look totally different; they almost look like the nacelles from the Enterprise-E. The trailer is meant to throw us by showing the Enterprise going down and then cutting to this ship crashing. They underestimate us!