The Hangover 2 Trailer: Yanked From Theaters!

Just a week after the release of the extended trailer for The Hangover Part 2, it's been yanked from theaters, specifically after it was shown before Source Code.
Why? Because it looked so much like the original that the mystery is gone? Because of the banana scene? Because Jake Gyllenhaal didn't want to be upstaged?
No one really knows, but director Todd Phillips says it's not because it's too graphic. In fact, he insists it's "too PG-13" to show what the movie's really about.

Warner Bros said only this in a statement: "In our haste to meet placement schedules for this trailer, we failed to properly vet the final version with the MPAA. We acted immediately to correct the mistake and removed the trailer from screens."
What do you think? Why pull it a week after the trailer's release?