User blog comment:D.Ryan/Irrational Games Disbanded! Future of BioShock Series Uncertain!/@comment-24819226-20140708204351

From Ken Levine's Twitter "RT @buzz3007: @IGLevine Will any more media be done about columbia/rapture? such as before the fall of either city?. -book in works."

Also the possibility of a comic is being looked into as well.

There is not yet any information on what the book will be about. Rapture or Columbia or when it will take place.

Source: https://twitter.com/IGLevine/status/486318771867361284