User blog comment:Damac1214/Zombies TranZit mode having details released from October 8th-11th, Zombies Gameplay Preview coming October 12th/@comment-4778612-20121008113202/@comment-4778612-20121008164647

Also, IMO, Winter's Howl>Scavenger because if you're using scavenger without PhD, you're gonna have a bad time, where the Winter's Howl slows them down, allowing you to evade the horde and reach a downed ally.