Yes, you can indeed play Warzone 3 for free. The new rendition remains free to play across all platforms, be it on PC or console. As mentioned, Warzone 3 will carry forward the entirety of the base game from Warzone 2 but will have new implementations that have been promised with the Modern Warfare 3 integration.

And, with the substantial Season One update for Call of Duty: Modern Warfare 3, everything from Warzone's Battle Royale to its Plunder and its Resurgence modes have all received new changes and content that either bring back fan-favorite maps into the mix or introduce wholly new systems or areas to explore.