Some of the most interesting stuff I hear pops up during casual conversations (in this case, over ribs with a bunch of other crew folks).
According to a friend of mine who's lined up to work on Transformers, Michael Bay is refusing to direct the movie if it shoots outside of the United States.
Basically, what this means is that if Paramount/Dreamworks decide to film the movie in Canada, they'll have to find another director, and they'll still have to pay Michael his rate under his "pay or play" contract.
Michael, you rock. Keep that work at home!*
*no offense intended to any of my non US-based readers. You all rock, too.