Curse of Strahd was released in 2016; since then, there have been many supplement books with extra races and subclasses.
Are there any combinations of races/classes I should advise players to take in our session 0 tonight?
For example: one of my friends was eyeing up the Aarakocra race, who can fly. Although this is unlikely to break the game (and not unique to Aarakocra), it could theoretically spoil an encounter. I'm just using this as an example as I do not know many of the new races/subclasses!