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NeoGAFs Kent Brockman

Call of Duty’s battle royale will release in early March | VGC
Development sources detail and date Activision’s highly anticipated Warzone…

It was suggested that Warzone could drop as soon as in the next few days, however VGC understands that the mode is “at least a few weeks away” and bar any unexpected delays, will most likely release in early March.
Given that Modern Warfare updates are typically deployed on Tuesdays, March 10 is the most likely candidate for Warzone’s release date.
When its release date arrives, Warzone will instantly unlock for all owners of Modern Warfare via a currently greyed-out menu item, US development sources indicated.
The battle royale mode will also be released as a standalone game for free, with the option for players to purchase an ‘upgrade’ to the full version of Modern Warfare.
Warzone will likely share unified progression with the existing Modern Warfare battle pass, with cosmetic unlocks also made available in the battle royale mode.
Sources close to the game’s developer indicate that official marketing plans for Warzone will start this week, when invited North American content creators visit the studio to play and capture the battle royale mode ahead of a future announcement.