Originally Posted by Seraphael
I've started updating my D&D software from 3e to 5e. Too early to start theorizing though. Does anyone know if material from books other than PHB, like Xanathar's Guide To Everything, will be included in BG3? If so Gloom Stalker ranger would be of interest.

They have not stated much. They said that they are mainly focusing on PHB, DMG, and MM, but also are looking at other books (yes, just that vague). And they have said "all PHB classes and subclasses will be in, but we're only talking about the revealed races for now."