Do you guys think they will put the gloom stalker?
That would be fun, but probably not. At least that seems unlikely for the regular release. From what we've seen in the EA, it looks like they're going to focus on the Player's Handbook options (+ Oathbreaker Paladin from the Dungeon Master's Guide).
That being said, subclasses released after the core rulebooks tend to be very popular. Hexblade Warlock and Gloom Stalker Ranger having been mentioned ad nauseam in regards to BG3 since early access began, so maybe we get lucky. Could be a nice selling point for a DLC to include opular subclasses.
