Calling it now
At the end of the trailer, we see Dom and Charlize Theron standing around in that control room with the entire team at their fingertips.
There will be a long speech from both of them, followed by questioning from the team. After that, Dom will look as if he's going to shoot one of the team members, then turn his gun to Theron. He'll explain to her his REAL motivations, shoot her or call in the cavalry to arrest her.
Then they'll spend time showing a montage flashback explaining how Dom was able to play both sides, maybe an undercover type situation.
There will probably be scenes during the movie where he could have killed a team member if he wanted, but for some reason didn't (because he's undercover).
So dumb, but in a hilarious way.