According to the tweets by Ken Levine, Games creative director, Irrational Games and 2K Games are expected to reveal BioShock Infinite’s DLC sometime today.
Levine initially tweeted saying-“excited for tomorrow” which led to speculation and further inquiry which revealed that DLC for BioShock Infinite would soon be revealed. The main additions that the DLC is gonna bring is new characters, stories, and abilities, which would add hours of additional gameplay.
Source: gamespot