The latest patch updates the game to enable user made content created with the F.E.A.R. source code (out today) to be compatible with the game. The news of the patch, which was posted on the game's official website, also includes information on what to expect from the next patch.
V1.05 will feature two new multiplayer modes: Control and Capture All. Control pits two teams up against each other to gain control of thee Control Points. In Capture All, five Control Points are available and in order to win, a team must take control of all five points.
You can download the V1.04 update, along with the SDK and updated server software from a number of mirrors listed on the game's website.