Oath of Vengeance for Paladin class. First some overoptimistic people thought 100% sure every subclass in Players Handbook will be included- likely n other subclasses from other DnD 5 books. Now when they do understand that the game will be released in August 2023 it has changed the tune to MAYBE include stuff in Players Handbook. Well and we know that there is list of example Paladin class spells to level 3. Paladin will get level 4 spells when they are level 13.
Do you understand that perhaps max level will be level 12 and not even 13

eat it and accept it. Of course an expansion might later increase level to 20. Of course it is possible that level 13 would be but then they must do level 4 spells to Paladin. Why I am happy for not very high level 13? Well I dislike slightly very high level in DnD5 though I will not cry if maximum level would be example level 15 and they do level 4 spells to Paladin if that happen then so it will happen I accept that.
It's the class specific dialogues that lead me to suspect multiclassing will be axed. They feel quite - mutually exclusive.
Perhaps I do not know what will happen. However perhaps max level is 12. That said they can do expansion say in 2025 and then maybe max level would be 20.
What outside of PHB? Twilight Domain (Cleric), That said I would they do PHB,,, This is so much overoptimistic.