Having helped usher in the idea of the season pass and one of the few who ever offered a second pass, Gearbox is no stranger to DLC.
In fact, by the time Borderlands 3‘s run is done (in 2030?) it may not even be the same game, seeing as Borderlands 2 got a bridge-DLC nearly seven years after launch. Anything could happen is what I’m saying, and with Moxxi’s Heist of The Handsome Jackpot as the first of the premium lot, wackiness is already on the table.
Source: Destructoid Review: Borderlands 3: Moxxi’s Heist of The Handsome Jackpot