Titanfall is free to play for 48 hours through Origin Game Time.
Apparently the offering was so popular, EA brought it back.
Starting today, players who did not claim Titanfall Game Time the first time out, can add the game to their library and play for free for 48 hours.
The clock doesn't start until begin until you’ve launched the fully-downloaded game for the very first time. So, start your download whenever you want, and downloading doesn't count toward your time.
Game progress will be saved so you can pick up where you left off if you buy the game.
More details through the link.