Underworld Ascendant is pitched as a spiritual successor to Ultima Underworld by Otherside Entertainment. The indie team has some very familiar veterans working there- Paul Neurath is the founder who worked on Ultima Underworld and the original Thief and Warren Spector responsible for Deus Ex, so these are the folks who helped define immersive sims.
You play as The Ascendant with the goal of saving The Stygian Abyss. You may engage in direct combat or sneak your way through- like many immersive sims. But Ascendant will give you more systems and environmental physics to interact so you can devise your own traps and out-of-the-box thinking to succeed.
If you are a fan of the recent Deus Ex (which is still in hiatus), or Arkane’s work such as Dishonored and Prey, Underworld Ascendant might be up your alley. The game will be out in September this year, with a playable build to be showcased at E3 2018.