Bethesda and ID Software announced yesterday that DOOM Eternal would no long release on November 22 2019, but would now release on March 20, 2020.
In addition to that DOOM 64, which up until now as only announced for Switch, was announced as coming to all platforms and would be free to any player who pre-ordered the game, but for some reason, that release was also moved from later this year, until March 20, 2020.
Finally, if that was not enough, the Switch release, which was set release day and date this year, has no longer got a release date and will be released sometime in the future, though when is not decided. On the good news front, Invasion will be making a return, so there is there. Here is the full statement from the developers.