Well, first of all...this is really, really early.
Second of all, photoshoots are not run by staff (or the con at all)..so if a staffer isn't participating in one, they most likely aren't going to know about them.
Thirdly: Photoshoots aren't really ever established until the last week or two before the con, because of the events schedule. Without knowing when main events are, you can't really plan a photoshoot.
Personally, I'd wait until we get a whole lot closer to the con.