User blog comment:Callofduty4/Black Ops 2 campaign demo, much info released/@comment-217.199.54.138-20120523063345/@comment-84.160.199.223-20120523234106

"You know Treyarch is using a different engine that infinity ward, meaning it will be almost impossible to steal the models and animations."

Wroooong. Their engines are both a modified id tech 3. Also, they have access to everything they made. See AK-47, it has the exact same animations since CoD4...