The spot they are all talking about meeting is a park off Cross Bay Blvd. which is good only if she departs 31L. Check the map out on my website for location marked A.
Follow links for aviation photography and spotting.
That spot is only good for 31L departures. If she goes any other runway you won't get a picture. I know we've had this discussion before. If they are using the 04s Concorde is not allowed to take off on 04 and they can either send her off of 13R, 31L or stop the traffic and send her 22R. If she doesn't go 22R then it's probably going to be 31L, but who knows. The better spot for 22R is marked F. The consolation about being at F if she does go on 31L is that you can still get a shot. She'll be small, but she should pass overhead the 04L departure traffic.
The next thing to remember is that it's going to be quite dark that early in the morning so we shouldn't set our expectations that high. But, anything will be worth it in my book.