IGN today reported that Borderlands 2's level cap, currently at 50, will rise sometime in the first three months of next year.
It's not going to come with Sir Hammerlock's Big Game Hunt, announced and previewed today. 2K Games told IGN that Gearbox Software still is considering whether to do it as part of a DLC extension or as a separate download.
The studio did both in the original Borderlands in 2010, raising the cap from 50 to 61 with The Secret Armory of General Knoxx and then raising it to 69 with a free update.
Additionally, 2K is said to be thrilled with Borderlands 2's sales performance, and is envisioning a second "season" of DLC after this one concludes. Big Game Hunt will be the third of four promised extensions.