You don't look the sort who can afford to turn down a legitimate spoiler warning.
Yes, this is a video of Burial At Sea's first five minutes, and YES, there will be some minor spoilers. So what's up, chum? Spliced any good plasmids recently? Don't look too close at the kids over there; you may see something you don't like.
Burial At Sea is the first story DLC for BioShock Infinite. You're still playing as Booker, and you're helping out a mysterious woman who you may or may not recognize, but as to where you are and what you're up to, it's a little wetter than Columbia, and you're looking for Sally. Who's Sally? Now there's a question. Remember, questions are a burden to others, answers a prison for oneself, as another prisoner has been known to say.
Burial At Sea: Episode 1 is due by year's end, at $14.99 on its own or $20 as part of the Season Pass.
Source: Irrational YouTube Channel