I just checked on a break wife had playing, it's 5.6.3p3 and updated PCGW and it seems to be 64-bit only (at least on Linux). Since it's 5.6+, someone can check the -force-vulkan command to see if Vulkan is enabled, so I don't have to interrupt my wife's play . If not, I'll update if it works later.
Also, now that game is live, you can see the game's DLC in SteamDB, one being Pillars of Eternity II: Scavenger Hunt - Cutthroat Cosmo we're all aiming for obviously (and no more "hidden" ones, at least on the first glance)