Whilst this is about D&D/FR and not technically about BG3, I'll leave it here on the assumption that Paladins will eventually make it into the game.
I mean, Paladins are mentioned on the BG3 Wiki (along with barbarians, bards, sorcerers and monks) and as such, they are a part of the BG3 universe that takes place in the Forgotten Realms. I would assume, since it is a roleplaying game, that roleplaying aspects of the game is fair and square to discuss.