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Also, Deathstroke has been confirmed as a playable character and those who pre-order now will get early access to the Deathstroke pack.
From the Press Release
Deathstroke confirmed as playable character in Batman: Arkham Origins challenge mode pre-order now for Xbox 360, PS3 and PC for exclusive early access to the Deathstroke pack.
Today, Warner Bros. Interactive Entertainment and DC Entertainment confirmed that Deathstroke will be a fully playable character in the challenge mode for Batman: Arkham Origins. Fans who pre-order the game for Xbox 360® video game and entertainment system from Microsoft, PlayStation®3 system or Windows PC will receive exclusive early access to the Deathstroke pack.
To learn more, visit the official Batman: Arkham Origins website.