A new Battlefield 3 Armored Kill server side patch will be released later today. It will fix some issues and tweak gameplay. The main changes affect the Gunship in Armored Kill, which will now have a 60 second spawn delay regardless of server spawn settings. This is because some servers with modified vehicle respawn times made it difficult to capture the flag controlling the gunship. The gunship in the Rush mode has also been tweaked.
The new patch also fixes some bugs, like improved server stability and a fix to the radio beacon exploit where players could spawn on the roof of buildings not meant to be included in games. You can find the full patch release notes here.