"Men In Black 3," possibly the least-demanded threequel since "Crocodile Dundee in Los Angeles," has a newer, longer, plot-explainier trailer. Will Smith (who should really have better things to do with his time) time-travels back to the 60s to partner with Josh Brolin as the younger version of Tommy Lee Jones (who does have better things to do with his time, hence the time-travel storyline.)
Ah hah hah hah hah hah! A notably-unusual famous person is actually part of the MIB/Alien-Coverup scene! That bit NEVER gets old, amirite?