[Update #2]: World War Z is adding Horde Mode XL with an utterly absurd number of zombies to fight.
[Update]: Aftermath has now shambled onto PC and consoles, though not without some technical trouble.
If you're itching for some sort of excuse to whip out the ol' chainsaw and go to town on a massive horde of zombies, you'll be happy to hear that the co-op focused World War Z is soon getting a brand new expansion. Once Aftermath arrives on September 21, 2022 it'll bring with it three new campaigns set in Rome, Vatican City and Kamchatka, greatly improved melee combat and a first-person mode option, as well as whole host of new toys to torment the undead with.
First things first, allow me to share with you the recently posted and developer guided gameplay overview trailer. It should give you a pretty good idea of just what all of this looks like in action. Have a gander:
The good news doesn't end there, however, as the developers are also planning to add a Horde Mode XL as a part of a free update. Much like the name would suggest, Horde Mode XL will have you fight increasingly tougher and more numerous hordes of enemies, eventually culminating in battles with hundreds more zombies than the current version of World War Z can manage!
It's also worth mentioning that Aftermath will bring with it custom challenges with their own rules and modifiers, as well as fancy rewards. These missions will change on a daily basis, so as long as the developers create enough unique modifiers to keep things fresh and interesting, this whole system could be a pretty fun way to extend World War Z's replayability even further.
Whatever the case may be, I'll make sure to let you know once Aftermath launches. Until then, you can read a little bit more about the expansion and its contents over at Steam.