It seems that Obsidian Entertainment accidentally rolled out a turn-based combat mode for Pillars of Eternity II: Deadfire this past week, or at least it appears to be accidental based on the fact that they quickly issued a hotfix to patch it out a few hours later. PC Gamer has the full story, with screenshots and a link to a video on Google Drive that can't be watched due to excessive plays:
Reddit user raggnarok first flagged the new combat mode, which was added on Thursday and removed a few hours later in a hotfix. In turn-based combat, each character could move a limited distance and perform one action per term, raggnarok said.
Developer Obsidian Entertainment hasn't yet commented on the mode, so nobody is quite sure what to think, but perhaps it's working on a full-blown turn-based mode and pulled the trigger prematurely. Such a mode would completely change the balance of combat and, I suspect, require a full-scale rework of many skills and spells.