No, Titanfall will not outsell Killzone. Titanfall is a new IP whilst Killzone is an established franchise that is also bundles with the PlayStation 4 - a console/bundle that is still in high demand.
The Xbox One install base is not that high, meaning that at least 2/3 of current Xbox One owners will have to purchase the game.
The Titanfall Beta was joined by 2 million players, spread across both Xbox One and PC, and some of those who participated will have decided against buying the game when it releases.







