Irrational's Ken Levine has revealed that Bioshock Infinite is to follow the example of the original Bioshock, and won't include any kind of multiplayer.
2K Marin developed the only game in the series to include a multiplayer option, Bioshock 2, and it was initially thought that Infinite would follow suit and include some kind of online option. But Levine recently took to Twitter and laid it out in no uncertain terms: "Nope... No multi," he told one of his followers.