EA is offering two days of free access to Titanfall on PC.
It comes as part of the publisher's Origin Game Time initiative. PC owners with Origin installed are able to download the game for free and, once loaded up for the first time, play it for nothing for 48 hours.
Note that means 48 hours in real-world time, and not 48 hours of in-game time. However, you're free to download the game and then start up your free trial whenever you want.
Your progress will be saved even once the trial has expired, however, meaning that should you subsequently buy the game you'll be able to resume from where you left off.
It's also worth noting that the offer isn't available to those who participated in the same deal the first time it was available.