For the uninformed, the collection features Zombies maps from the previous games in the franchise that were developed by Treyarch. It includes Nacht der Untoten, Shi No Numa and Verruckt from Call of Duty: World at War as well as Ascension, Kino Der Toten, Moon and Shangri-la from Call of Duty: Black Ops. The Origins map from Call of Duty: Black Ops II will be featured as well.
Along with improved visuals, the new versions of the maps add the GobbleGum functionality along with 10 new GobbleGums and 2 new Whimsical GobbleGums. Call of Duty Black Ops III Zombies Chronicles will be released on the 16th of May in the North American region.
If you don’t have enough free space on your PS4 HDD for the add-on, then you might want to consider getting an external hard drive like the Expansion 2TB Portable External Hard Drive from Seagate (you can check it out with this page).