On an earnings call Electronic Arts CFO Blake Jorgensen emphasized that Titanfall will in fact stay exclusive on Xbox and PC for the lifetime of the title. While their is some confusion as to what that means one thing is certain, the first Titanfall will never come to PS4 or any other platform for that matter.
Vince Zampella was only made aware of the situation as recent as yesterday, after the announcement. He did emphasize that Respawn Entertainment will be working on PS4 so you can possibly expect future titles to span to more platforms.
Titanfall comes out March 11th, 2014 for Xbox 360, Xbox One and PC.