User blog comment:Magma-Man/Top Ten Game Franchises I Want Back This Gen/@comment-4738372-20140620161038/@comment-1854594-20140620224748

I don't see why it would be a different engine, it's Idtech. It's possible they made a new iteration (which would be Idtech 6) for Doom but since Carmack left I doubt it, they are probably just goingto use 5.