While Shockwave has already been confirmed as the film’s villain, Bay added a bit of information, saying that he’s "got a much bigger gun" and is "more vicious" than Megatron.
"Sentinel Prime is great," Bay added, confirming the character, "He’s great. I can’t tell you anything else, other than he’s great."
Bay also reiterated that this entry would be his last for the franchise.
"It does have an end, yes," Bay said, "Because I am finished doing this."
Transformers: Dark of the Moon will hit regular theaters and IMAX in 2D and 3D on July 1st.