The next God of War, which currently has the working title of Ragnarok (though that's confirmed not to be the official title), has officially been delayed from late-2021 to 2022. This was confirmed by Santa Monica Studio who released a letter on their Twitter account that explains it and also apologizes to fans who were expecting to see Kratos' next game this holiday season:
Little is known about the game except Kratos was teased in a dream sequence at the end of the 2018 game to be set for a violent confrontation with Thor himself. In addition to the announced delay, God of War: Ragnarok has been confirmed not to be exclusive to the PS5, but will in fact also be available for the previous generation console, PS4. Stay tuned!