Disclaimer: Only for the English version right now. The other versions will be updated soon.
A new campaign for Trench Face with the same length of the main game, if not longer.
Things to know:
This campaign is more difficult than the main game.
Resources such as ammo are more precious this time.
Gun wielding enemies are a much bigger threat as well.
Level design is not as linear.
The Main Game:
Besides a couple of improvements such as guns telling you if they're already loaded, the main campaign will stay the same.
To not change the experience for players who like it as it is.
Music:
The music is now doubled.
Songs are now a bit randomized whenever you enter combat. This way you get a variety of songs instead of the same one for a certain area. (unless it's a boss)