They Shall Not Pass includes a brand new game mode called Frontlines and its a mix of Conquest and Rush, two popular modes from the vanilla version of the game.
Here is how DICE describes the new game mode. If you are a fan of Rush and Conquest, it's an excellent mix of the two.
"Experience a mix of Conquest and Rush as you fight for chained control points in a tug-of-war frontline. Both teams fight for one flag at a time and when this objective is captured the action moves on to the next. Capture the enemy’s HQ control point and the game turns into a Rush-style section where telegraph posts need to be attacked or defended."
You can get a feel for the game mode in the video below.