I would say that there is a small but not zero percent chance that we get level 5 unlocked if this is the last full patch before release. I wouldn't bet on it, but it seems like something that would make sense for a final patch.
Meanwhile, I wasn't really planning on running a paladin since the class has never called out to me-not that I didn't like it, I just never had ideas for it-but a chat with a friend and a look at the paladin class in the player's handbook has inspired me. So I'm gonna run a Seladrine drow paladin, oath of vengeance if it's included in the patch. Noble background, arrogant yet noble, sworn to war those who commit evil, with the lolth-sworn drow considered at the top of her hit-list. So the cult of the Absolute, being clearly evil and also aligned with lolth-sworn would instantly become a top-priority target for her. There's a chance she'll have to kill Astarion, but depending on circumstances she also could reasonably let him live, same goes for Shadowheart.
Yeah the 5E Paladin is much better than the traditional 3.5 and prior version of Paladin. You are less constrained to be "perfectly virtuous" in all things and instead you can be more mission-focused. Paladins in TT on prior additions were notorious fun-vampires because they could be played in a way that severely disrupted the campaigns.
I actually look forward to playing a Paladin in BG3 and seeing how Larian implements it.