Here is a little summary, based on media sources: Yesterday, Ken Levine's GDC session kicked off with a Bioshock introduction by Zero punctuation's yahtzee (see above). Ken Levine then explained how 2K Boston made some changes after their initial idea of how the story should be told in Bioshock.
At first, they had a concept of a massive background story, spanning over 70 years, with several civil wars to tell about and a big cast of characters and love stories, to carry on the storyline. Then, they cutted things down and let the world itself tell the story (see Rapture before change below). Developer's tend to too much complexity in video game stories and that is a problem, Levine believes. Too complex stories would not fit well to video games.
Levine sees playing Bioshock like reading a detective story and that it's important for players to solve and discover things rather than just getting something shown and explained.
Mystery, in Levine's opinion, is also a key element of a game, since "Answering questions is sometimes not as interesting as asking them". Too much mystery without answers is boring, though.
Ken closed his session with the phrase: "Developers must respect their audience, trust mystery, and empower gamers."
Sadly, no media source mentioned hints about possible sequels/prequels of the game, Ken Levine could have dropped.
