The heaviest Titan class available; 'The Ogre', weighs around 500lbs. There are humans alive today that weigh more than this.
Respawn Entertainment (the developers behind Titanfall) was formed by Vince Zampella, and other former members of Infinity Ward (the developers behind the 'Modern Warfare' series), after the legal battle with Activision over 'Call of Duty: Modern Warfare 2'
To celebrate Titanfall's one year anniversary all its DLC was made free for everyone.
A formal single player campaign was scraped to focus on the online multiplayer which was always the main selling point for Titanfall. A campaign is still featured in the game, but it's just multiplayer matches with characters narrating over the match.
Although Titanfall on console is an Xbox and PC exclusive, it's been confirmed that its sequel will come to the PlayStation 4.