"When we announced the release date of BioShock Infinite in March, we felt pretty good about the timing. Since then, we've uncovered opportunities to make Infinite into something even more extraordinary," said Irrational Games Creative Director Ken Levine. "Therefore, to give our talented team the time they need to deliver the best Infinite possible, we've decided to move the game's release to February."
Levine also mentioned in a separate statement that the game will be going dark from here on out, noting it will not be shown at mega events E3 and Gamescom.
"That way, the next time you see our game, it will be essentially the product we intend to put in the box. Preparing for these events takes time away from development, time we're going to use instead to get the best version of Infinite into your hands in February."