Killzone 3 has been leaked onto the internet, two weeks before the games release. Both the 3D and 2D versions of the game are available, but they had differing sizes - with the 3D version needing a 41.4GB download.
The 2D version comes in at half of that, but only both of the versions are only available to play on hacked PlayStation 3s.
The retail release of Killzone 3 comes out on the 22nd of February in the Unites States and the 25th of February in Europe. Currently the open beta is under-way.