I actually just got done taking the new conceal carry course in IL and my instructor, who is a IL policeman and shooting instructor, made very clear to us that in IL we are not required to offer up any info about our conceal carry. Now if they ask, then we must tell them we are carrying, where it is on our person, and show them our CC license. But we only have do to as much as they ask. If they don't ask we are not obligated to tell. The law gives them no right to take our weapon, though he advised to do so and sue later, only to ask those questions.
It really surprises me that IL is like this. I figured we would get arrested, beaten, questioned, ordered to surrender our possessions and be forced to give a 30 min exhortation on the love we have for the Fuhrer of IL.