3D Realms has announced that its new first-person shooter, which will be powered by the Quake 1 Engine, will be officially revealed tomorrow. The team has also revealed a teaser image that you can find below.
— 3D Realms (@3DRealms) March 6, 2019
From what we know so far, 1C Entertainment will be publishing this title. In October 2018, 3D Realms shared a small GIF showing some gameplay footage from this shooter, and that footage hinted at some portals similar to those found in PREY (though this is just an assumption from our part and nothing more).
Our guess is that 1C Entertainment and 3D Realms will reveal the first details and a gameplay trailer for this unannounced FPS tomorrow, so stay tuned for more!