BioShock is one of the most anticipated games, and it should appear on August 21 this year.

Finally Irrational Games and 2K Games lifted the embargo on BioShock and previews of "unnamed System Shock 2" successor have started to appear.

The headline on Gamespot surely promises a lot: "After years of anticipation, we finally got to play the first two hours of Irrational's highly awaited action role-playing game, and we weren't disappointed", so we strongly advise to head over there and check it out.

IGN and Firingsquad have also previewed the game.