User blog comment:Damac1214/Rumor: Map Pack 3 Leaked + Map Pack 3 Reveal Trailer coming soon/@comment-91.67.152.139-20130618144234/@comment-25496444-20130618190326

Key words: "through a DLC pack".

As well as Thundergun not disabling your Jugs (which is a huge minus) and being able to kill all 24 zombies more easily and without Pack-a-Punch.