From the Press Release:
Zombies returns in all of its undead glory with “The Giant,” a Nazi research facility featuring the weapon upgrading Pack-A-Punch Machine. Re-live the chaos of Treyarch’s classic “Der Riese” Zombies map, picking up the Zombies story with Dempsey, Nikolai, Richtofen, and Takeo where Origins left off.
“The Giant” is a bonus map included with the Call of Duty: Black Ops III Collector’s Editions. Pre-order and secure your copy now: https://www.callofduty.com/blackops3/ce