User blog comment:KATANAGOD/BREAKING: DLC 5 revealed in a blurry uneven pixelated image. Inside sources at Best Buy say "Its legit"/@comment-1913529-20130807052341/@comment-25496444-20130807075427

Jokes aside, considering there's only been two titles since BO, it's not unlikely that BO2 would have a fifth pack. The only thing against it is that the season pass only gives you four DLC packs which implies all of them, but still, not impossible by any means.