User blog comment:TheBlueRogue/Bioshock Infinite DLC: Clash in the Clouds released, Burial at Sea announced/@comment-27.252.130.71-20130731115018

you play as booker dewitt again but in 1957 before the rapture war, in the reality where comstock or Colombia never existed, you never met Elizabeth either and she is a character in the dlc as well, it's split into two parts. Part one comes this September and part two arives in January next year,

People on reddit were wondering why booker and Elizabeth don't know each other, but Colombia never existed I this reality so it is impossible for booker to know Elizabeth,

I already cracked this thing wide open.