19 DOOM Eternal
Whether or not variants fit into the equation, it's not that difficult to double the enemy types in Doom. RPG's have lots of enemy types. Doom's isn't really that many.
The studio has plenty of material to pull from like their Doom3-specific monsters and their DoomRPG games have some neat new creatures like the Sawcubus.
Of course we only saw a few new enemies in the E3 trailer. It wasn't a real trailer, it was a teaser/announcement trailer. Even in a real trailer, it would be dumb to spoil too much. Expect more cool stuff.
99 DOOM VFR
Would really like to see other Doom titles ported properly on Switch, Doom 3 with all expansions and some cool mods for example, I'm really tired of relying on the 360 version of bfg edition and all of its bugs, please show Doom the respect it deserves