The Gearbox rep related, "Through the course of our grand experiment, we’ve also learned that fans are happy with an a la cart menu for DLC because they can pick and choose the content that they most want to buy and really customize their Borderlands 2 experience."
According to the rep, The first Ultimate Vault Hunter Upgrade Pack in the Season Pass delivered greater value than originally intended. “They’re voting with their wallets – and we are grateful that there are enough of them asking that we can justify the cost of developing the content,” the rep noted.
Xbox One and PlayStation 4 versions of Borderlands 2 will be released in 2014 as well.