According to Reddit user ‘FallenFusion’ who’s been dishing out Titanfall information, maps contain Turrets which essentially kill everything.
The turrets are generally based on high locations such as the top of buildings and have a “considerable range of motion and excellent target tracking systems”. The turrets can also be “flipped” or ‘hacked’ by a particular team with the use of a data knife giving the operating team additional support and strength.
Here is the description given by the Reddit user:
Heavy turrets are designed for killing everything—including Titans. When used out in the field, they are often braced into position in urban environments atop buildings, and have a considerable range of motion and excellent target tracking systems. Multiple Titans are usually required to disable a single heavy turret by focusing their fire on it. They operate autonomously and, in most cases, can be “flipped” (to fight for the other team) when a nearby console is compromised, often with a Data Knife.
Here is an example of the turret: