User blog comment:Damac1214/Rumor: Map Pack 3 Leaked + Map Pack 3 Reveal Trailer coming soon/@comment-91.67.152.139-20130618144234/@comment-1263839-20130618163734

@MLG: Wunderwaffe was going to be in Kino der Toten, we've seen audio files of characters getting it in Kino.

It's only inferior quality to the Thundergun is the fact that the Thundergun doesn't hurt you.