http://www.ign.com/articles/2014/07/18/doom-gameplay-unveiled-at-quakecon-2014-Fast-paced combat against multiple enemies at once - Doom 3 this ain't.
-Set outside a massive UAC research facility on Mars as it's being invaded by the forces of Hell.
-Hellknights, cyberdemons, revenants, mancubii, and other classic monsters were spotted throughout the demo.
-Classic Doom weapons, including the fan-favorite double-barrell shotgun return. Plasma rifle, rocket launcher, and the good old chainsaw were also shown off.
-Go fast. "Doom is not about about taking cover" said executive producer Marty Stratton.
-Doom is powered by IdTech 6, and will be for PC, PS4, and Xbox One. They are "committed" to 1080P at 60 frames-per-second.
-Wonderfully gory close range executions, including special ones for dropping down on enemies from above.
-Revenants now have jetpacks and can hover about while firing rockets at you.
-At least one weapon, the combat shotgun, has an alternate fire mode, which allows you to charge up and release multiple shells in rapid succession.
-Sprinting, double-jumping and mantling are all possible, making for very fluid motion during combat.
-Enemies can teleport in for old-school style ambushes
-Dying results in a crazy fatality scene depending on what killed you a la Dead Space. Revenants rip your arms off and punch straight through your combat helment.
-Old school mechanics. No reloading your clip, hold as many weapons as you want, health and ammo pick-ups etc. NO REGENERATING HEALTH.
-id Tech 6? I didn't think it would be used in Doom.
-No regen health... woo!
-Starts on Mars? Maybe you go to Earth later...
-Brutal executions... sounds like they're fans of the Brutal Doom mod.