Coming in the next big content update to the game, these weapons include a pistol that shoots explosive rounds. It's meant as a close-range firearm, shooting the projectiles in a spread. It can also launch a grenade instead of the explosive rounds, which gives the gun a little more range.
Tripwire is also adding an RPG to the game. The developer has given it the possibility to shoot backwards and explode behind the player. It's not clear yet how exactly this happens.
Additionally, Killing Floor 2 is getting C4 and a grenade launcher.
These new weapons are a part of the Incinerate 'n' Detonate content update, which also includes several weapons that focus on fire damage. Among these are a flamethrower, Molotov cocktails, and a pistol and trench gun with incendiary rounds. Tripwire hasn't announced a release date for the update yet.