What is known so far:-Fast-paced and violent combat
-Several classic weapons returning: plasma rifle, double-barreled shotgun, chainsaw
-Several classic enemies returning: imp, revenant, mancubus
-Completely over-the-top close-combat kills on weakened enemies
-Ability to climb railings and onto crates
-No flashlight was shown but it wasn't needed
-Enemies teleported in, but appeared to be at preset locations
-Lots of corridors, but locations were very large to give the impressions of the playable area being larger than it was [not confined like Doom 3]
-Graphics were pretty good, but still rough in a few places [likely that will change some between now and whenever it's released
-No reloading and no recharging health
-Small, annoying enemies and larger, more dangerous enemies
-Some of the larger, boss-type enemies had unique close-combat kills [including at least one directed
at the player]
-Some dark humor [ex: while the PC was wielding the chainsaw, a demon tried to block the blade with its arms; a handprint was needed to unlock a door, so the PC ripped the hand off a nearby corpse]
-At least part of the game takes place on Mars
-Multiplayer was mentioned as being included, but it wasn't shown
-Brand new engine [id tech 6]
-The gameplay demo ended with a door opening to reveal the cyber demon shown at the end of the teaser
Also relevant:-id recently announced the hiring of Tiago Sousa, formerly R&D Principal Graphics Engineer at Crytek
Release date is currently unknown.