If you've been reading the Justice League books, you've probably already heard about the Red Room, the Black Room, and the Circus. Each room has a role to play at A.R.G.U.S.
Here's the shorthand:
Red Room- The world's largest covert research facility for housing extraterrestrial, unidentified, and classified technology from across the globe. This is where Victor Stone was turned into Cyborg. The Red Room is managed by Dr. Silas Stone.
Black Room- The world's largest covert holding facility for housing supernatural, cursed, and mystical artifacts from across the globe. This room was managed by Doctor Mist before he betrayed A.R.G.U.S. Who could run it next? Possibly Black Orchid... or maybe even Raven?
Circus- This room has had little to nothing revealed about it, but based on its name and the roles of the other rooms, it's probably safe to say that it's a covert research facility for alien and metahuman biology and biochemistry. The name is probably a derogatory nick name for Cadmus or the Green Room. Beast Boy is currently red because he's part of the Red. But that could be retconned. Martian Manhunter could also inherit this room...
Admittedly, I've made a lot of assumptions. But in a few years, we could see each of these rooms under the the control of Marv Wolfman's and George Perez's creations. Just some food for thought. :-)
The three heads working together could form some kind of.. I dunno.. Doom Patrol (with traditional members of course) or Monster Squad (Frankenstein/Cyborg, Witch/Raven, Werewolf/Beastboy).