I just finished the Dlc yesterday and found almost nothing new, what i found (sorry no images, just put in your game to see)
-The Sword weapon: (don´t know if you can get in advance since it´s a side quest reward)
-A very cool Lighting grenade:
-An equally very cool Fire grenade:
Funny thing about these two grenades is that they appear on 158 as customization itens so... i don´t know if it will work, and can only see if it will work at night
-A very strange relic that let you be friendly with the sprites on the forest... (don´t know if will work cause it says unknown item on 158 and it´s a side quest reward)
-A unique machine gun (side quest reward) What it does? Well sometimes it will drop on the floor instead of reload...
That´s all i found so far, now post what you guys got