Still getting used to it so...guess they are not there?
There are MANY canonical races in 5E, but the races in the PHB are generally classified as 'common races'. Aasimar are an exotic race, of which there are many. We should expect to see the Dragonborn, gnome, and half-orc added to the playable races in BG3. I doubt we will ever see an aasimar, goliath, genku, aarakocra, firbolg, (insert about 15 others here) unless they are community modded in!
