Doom Eternal was supposed to come out in November 2019 but that is no longer the case as Bethesda decided to release it on 20 March 2020 instead.
Fans of Doom series will most likely feel like they just received a kick in the shins as Bethesda and id Software announced Doom Eternal will be released four months after the originally scheduled date.
The developers and publishers are trying to mitigate the backfire with several bonuses that will be added to Doom Eternal. One of them is Invasion Mode that will come soon after launch. This is basically the invasion mechanic from Dark Souls series where a player could enter another's session and attempt to kill them. There is one twist here, however, as invaders will take on the form of a demon rather than Doomslayer himself.
Nintendo Switch users will be happy to once again hear the confirmation that Doom Eternal is coming to their platform. There wasn't much info revealed in the announcement, except that it will release at a later date, compared to other platforms. Furthermore, Doom 64 will be made available for all four platforms and it will be a pre-order bonus for Doom Eternal.
The official reasoning on the is listed as the developers wanting to deliver the best experience possible to the players but it's not excluded that Bethesda wanted to dodge a really busy release window.
Bethesda
November 2019 is absolutely packed with anticipated releases such as Death Stranding, Need for Speed Heat, XIII, Age of Empires II: Definitive Edition, Pokemon Sword and Shield and Star Wars: Jedi Fallen Order. While the Doom community is devoted, there is no doubt sales would suffer in the larger picture due to the massive lineup for November 2019.
