The first ever gameplay video of Irrational's skybound BioShock Infinite has snuck out online.
The footage shows some freefalling through the clouds - as well as what appears to be some on-rails descent.
There's also plenty of gunplay and sound effects - both of which are heavily reminiscent of the first BioShock game.
Bioshock Infinite is set in the flying city of Colombia - a sort of Rapture in the clouds.
The game will reintroduce plasmids, as well as a brash art style and a new version of the Big Daddy.
Irrational boss Ken Levine has promised "more character interaction" than in his earlier games - and likened the feel of Infinite to "the Wild West.".
The FPS is due for release in 2012.