The new Doom Eternal release date is March 20, 2020 on PS4, Xbox One, PC, and Google Stadia. The Nintendo Switch version will launch at some point after that. However, the Doom 64 re-release will also launch on March 20 on all platforms as a pre-order bonus.
Doom Eternal Release Date Delayed - GS News Update
You'll have to wait a little longer to hunt demons.