I don’t think people are expecting one already, but you would usually expect the studio to at least have started on an expansion by the time the game itself releases. If they haven’t even started on one yet, that means any expansion is likely a couple years away at least.
I wouldn’t expect a race or two to take that long and would be one of the easier things to give players. I’ve seen many ask where the arokakra, or tabaxi, or Kenku are. Personally idc about those races but the Goliath would be fun, I had a buddy play one once and rp as the dumb muscle of the group