There have also been additional references made to some game modes such as Bodyguard (TITAN_ESCORT) and Big Brother. Now if you have been keeping up to date with Titanfall news, then modes such as Marked for Death is one of the modes introduced in the update and is currently in rotation, while Wingman Last Titan Standing is another mode that has been confirmed and is on the way.
This means that the remaining modes could potentially be part of a later update. Based on the brief descriptions of some of the modes, Capture the Titan is pretty much like Capture the Flag, except that you will be tasked to bring a titan back to your base. Big Brother mode has players defending the control panel and appears to be a timed event.
Of course none of these modes have been confirmed by Respawn yet so it is possible that they could simply be leftover ideas that Respawn had forgotten to take out. In any case gamers should probably enjoy the current update first and we’ll keep our eyes peeled for more information regarding the next one.