Id Tech 6

The id Tech 6 game engine, also referred to informally as id Tech 666 by id Software developers, is a technological successor of the engine which powered id Software's  and several ZeniMax Media internal developers' games. It will power the upcoming 2016 reboot of the classic Doom series previously called Doom 4, now also simply called Doom.

Technology
ID Tech 6 would work by raycasting the geometry represented by voxels (instead of triangles) stored in an octree. John Carmack claims that this format will also be a more efficient way to store the 2D data as well as the 3D geometry data, because of not having packing and bordering issues. It will virtualize geometry like textures.