If you've been on Killzone 3 recently, you'll have noticed that patch version 1.06 has gone live on servers across the world. You'll also have noticed that there was no patch version 1.05.
The planned changes for 1.05 have been included in 1.06, which has apparently fixed "performance issues" on the client's side. Guerrilla Games now believe that matches should flow a lot better. 1.05 was meant to include some fixes for the "score processing mechanics".
Killzone 3 went live at the end of February and Guerrilla Games has been implementing a ton of changes since the Open Beta, which ran shortly before the game's release.