It has been confirmed by Respawn Entertainment studio co-founder Vince Zampella, that Titanfall will indeed be launched without any mod tools
Confirmation below directly from Mr Zampella twitter.
— Vince Zampella (@VinceZampella) December 28, 2013
Titanfall runs on a modified version of Source Engine 2, and modders around the world have already shown some interest for the game and were eager mod, but right now all we can do is hope that the mod support will be available some time after launch via a patch.
Titanfall is slated for a release on March 11th 2014 for PC, Xbox One and the Xbox 360.