https://wccftech.com/world-war-z-horde-mode-update/

The waves of zombies you face in World War Z sometimes seem endless, and now with the game’s latest Season 2 content update, they actually will be. Horde Mode Z pits players who just can’t get enough carnage against unending and every-more-difficult waves of zombies, and it looks intense! The latest update also adds the explosive Bomber zombie type, and the usual assortment of new skins and cosmetics. You can check out a trailer for the Horde Mode Z Update, below.

Here’s a bit more detail about the Horde Mode Z Update: