Continuing the tradition of vaguely German-sounding DLC names, Warhammer: End Times - Vermintide's Stromdorf DLC brings with it two new rat-infested maps to explore, as well as a giant two-handed sword to dispatch said rats with. There are also a bunch of tricky achievements to earn, but Stromdorf's focus is most certainly placed on the new maps, so if you do decide to get it, make sure that's the reason you're doing so. Oh, and do keep in mind that you only need to purchase one DLC for your entire party to be able to play the new maps!
If you're wondering what all of this looks like in action you'll find the recently posted trailer down below. And while this isn't explicitly stated anywhere in the DLC, there does appear to be a brand new enemy to clobber! Have a look:
And that's pretty much everything you need to know about the Stromdorf DLC. If you're looking for a few more tidbits of information, or just a bit of lore, you can find what you seek on Steam. And finally, here are some images showcasing the new zones and weapon: