Last week Respawn Entertainment decided to remove Capture the Flag from the playlist in Titanfall on PC. The reason for this was that less than one percent of playing wanted to play Capture the Flag and so the numbers made it tough on the matchmaking system to find suitable matches. People would simply just spend a lot of time in the lobby waiting for the matchmaking to come up with something.
The reaction to this was large and loud. Far larger and louder than Respawn thought possible given the stats, and so they've decided to bring CTF back.
With it comes a host of changes to the matchmaking system. The idea is to make the wait for a CTF game shorter and in some cases this means you might be playing against players from other continents.
You can read a very detail account of the matchmaking over on the official Titanfall blog.