User blog comment:Damac1214/Rumor: Map Pack 3 Leaked + Map Pack 3 Reveal Trailer coming soon/@comment-25496444-20130618085541/@comment-109.17.213.48-20130618100828

... a ray gun in mp... it has twice the power of a rocket launcher and has the same mobility as a pistol...it would be the most op weapon that ever existed

so i think it would be in zombies (it's written, you have to read more closely)