In regards to Batman: Arkham Origins, it has been revealed that the plot will entail eight of the world's greatest assassins going after Batman. Deathstroke is confirmed. Who are the other seven?
Azrael - It would definitely be a great throwback to the Knightfall era, and totally up the series' alley moodwise.
Deadshot - Likely the very first boss.
Mirror Master (Chris McCulloch) - Not a Batman villain, but neither strictly speaking is Deathstroke: plus, don't tell me this wouldn't make for an amazing boss fight.
Lady Shiva - Almost a certainty.
Cheshire - Could be! God knows this series loves its poisons.
David Cain - Unlikely, but it would be a great excuse to get Cass back into the mix.
Lobo - Screw it. Why not?
Got any better ideas, folks?