Beastial might cover races like Tabaxi, Lizardfolk, Kenku, Aarakocra, ect... But also werewolves.
Planar we know applies to Githyanki and Warforged but that could be a general tag for Player races from other settings, aka not born on Toril, so if at a future point they add races like Leonids, Changelings, Kalashatar, Githzerai, ect..., then those will likely have the Planar tag as in they aren't from Toril, but were brought thier by the Nautiliod.
I'm betting all these playable races end up in and possibly more because honestly adding races is not that hard with BG3, modders have already done it with Goblins, Hobgoblins, Bugbears, Gnolls, Minotaurs, Mindflayers, and Gnomes so far and the game has been in EAfor less then a month.
The tags work easily enough and alot of the character race statements aren't voice acted, so it just a matter of writing the lines.
