id Software and Bethesdea confirmed that there will be nine mulitplayer maps at the launch of the new Doom.
They also released the trailer which showcase all the MP maps:
“Every map is constructed to keep the action brutally fast-paced,” Bethesda said. “These multi-tiered combat arenas are littered with hazards, and packed with items that can turn the tide of combat at a moment’s notice. And while they all have secrets for you to uncover, none of them are built to allow for easy sniping or hiding points.”