Deploy to an isolated research outpost in the new Incline Multiplayer snow map and battle with big heads on the pixel-art inspired Bitvela. Gain powers in the Mutation Playlist and face major gameplay modifiers in Havoc. Season 4 Reloaded also brings Unstable Rift to Zombies plus the aftereffects of the DNA bomb explosion at Popov Power, and more.’
Source : news.blizzard.com