From a co-op perspective, it's always good to hear something like this from developers:

Last December, during the 2017 Game Awards, we got a two-minute trailer that showed off some of the horrors that await the team of explorers. In his hands-on impressions (and in the footage below), Christopher details how stealth is an important part to GTFO as it helps to keep the horrors at bay:

Since announcing the game this past June, the Swedish developer has been pretty quiet on details about the title. With last night's trailer, it appears that we'll be getting more info with greater frequency now. The main focus of the two-minute video is the moment about halfway through when a bunch of monsters bust through a door and attack everyone. Prior to that, things are pretty quiet as four people make their way through some underground area in search of a vault. It's all very moody and while there are familiar beats (i.e., "we're busting into a place to steal some stuff and get out"), the part where "things go bad" and you have to try to get away looks hectic. You're not setting up defensive areas to trade bullets with cops, instead you and your buddies are working to just survive against a horrific swarm.

At the moment, there's not a lot of information about this new title other than the name and that it will be a "4-player hardcore co-op action horror FPS." Per the press release accompanying the little teaser trailer below, GTFO is being described as a kind of almost survival horror style game where players are forced to think on their feet and change up gearing based on ever-changing scenarios. Here's the little blurb from that press release: