Gearbox made their promised announcement of new Borderlands 2 DLC at PAX Australia, revealing plans for an Ultimate Vault Hunter Upgrade Pack 2: Digistruct Peak coming "soonish" to raise the game's level cap to 72, add a new training course, and provide an object lesson in the dangers of calling something the "ultimate."
There are details on IncGamers where they also have word on the announcement of another pack called Headhunter Pack: T.K. Baha's Bloody Harvest, saying that will come some time before Halloween, befitting T.K.'s newfound status as a zombie. The second Ultimate Vault Hunter pack will be $5.00 while pricing on Bloody Harvest is TBD, and while they specify the first DLC will not be part of season passes, they do not address this for the second pack, though as far as we know the season's pass has been fulfilled now.