User blog comment:Armyman234/Treyarch hands over DLC production to Raven Software/@comment-2257302-20101202023822/@comment-77.250.63.147-20101202172200

They brought Vacant, Strike, Overgrown and Crash back in MW2, because those were fan-favourite (that's what I heard, not a big fan of them myself)

So I bet Treyarch does the same thing.