You pretty much nailed it. The main thrust is saying that if a public (gov't) building wants to ban guns, they have to guarantee (metal detectors, guards, etc.) that no one is capable of entering with a gun. Agencies are screaming about "unfunded mandates" and our response has been "How much does it cost to take down a No Firearms sign?"
Passage of this, or any other bill, depends on much Arizona's gun owners are willing to get invovled.