"What do you think the chances are that the mainstream media might pick this up?"
Oh, I'd give it the same odds that the sun will rise in the west tommorow morning.
Has it occurred to you that if there was an Iraqi connection that was covered up, Bush would find out about it and make sure it came out at the time it would be most useful? Like when we were getting ready to make war on Iraq?
If this story really does hit the mainstream media tomorrow, mark my words -- the anthrax cases will be "solved" shortly thereafter.