Figured this needs to be brought back up now we get a month away from release! Roster's just about known now, with 27 of 28 characters revealed (Joker is suspected to be the last character). We can divide them more into factions this time...
Batman's Insurgency
1. Batman
2. Harley Quinn
3. Flash
4. Blue Beetle
5. Black Canary
6. Swamp Thing
7. Doctor Fate
8. Green Lantern
9. Firestorm
10. Green Arrow
Superman's Regime
11. Superman
12. Wonder Woman
13. Robin
14. Cyborg
15. Black Adam
Gorilla Grodd's Society
16. Gorilla Grodd
17. Deadshot
18. Bane
19. Poison Ivy
20. Catwoman
21. Cheetah
22. Captain Cold
23. Scarecrow
Wild Cards/Neutral/Unknown
24. Aquaman (Former Regime but appears to be Neutral)
25. Atrocitus (Searching for Green Lantern, appears to be independent)
26. Supergirl (Appears to start as Regime but switches to Insurgency?)
27. Joker? (?)
28. Brainiac (Appears to threaten all groups)