I went to two of those shows, and for both shows "a special guest" was announced beforehand. I don't think this has happened for this coming tour, which I'm also going to, but maybe they really want it to be a surprise this time.
But if you check out the setlist from other shows on the tour, she hasn't appeared, though maybe that was just because of scheduling conflicts. Anyway, obviously I hope that she does. Seeing Insider live was a real thrill.
I can let you know about the Berkeley show in September.
Kevin