http://www.ign.com/articles/2012/12/07/bioshock-infinite-delayed-again
It’s primarily polish and bug fixing. You know, 'let’s make that narrative scene that much better. Let’s do another pass on the timing of that scene. Let’s do another balance pass.’ It’s a game we could have shipped in February. It just wouldn’t be the game that we think the fans deserve. And that doesn’t mean it was far off from that, but they deserve what they deserve. And when we ask people to pony up a lot of money for this game, we have to feel confident that we’re giving them something that they deserve.
It’s primarily polish and bug fixing. You know, 'let’s make that narrative scene that much better. Let’s do another pass on the timing of that scene. Let’s do another balance pass.’ It’s a game we could have shipped in February. It just wouldn’t be the game that we think the fans deserve. And that doesn’t mean it was far off from that, but they deserve what they deserve. And when we ask people to pony up a lot of money for this game, we have to feel confident that we’re giving them something that they deserve.