No, it's definitely not a rumor. There's no question they raided a facility based on intelligence, and there are apparently a good amount of chemicals. We'll have to wait and see about who was using it, since when, etc.
According to an interview with a lieutenant colonel, they recovered around 1500 gallons of chemicals, primarily in three types. He said what types they were, but I can't recall the exact names, but he did say that you don't make fertilizer or bug spray out of them.