It's the class specific dialogues that lead me to suspect multiclassing will be axed. They feel quite - mutually exclusive.
If that happens, so again one of the most basic Baldur's Gate elements for me is not given, then it would be one more reason that this game is DoS 3 with D&D setting for me and not BG 3.... On the other hand, I can't imagine that Larian didn't consider this with foresight and hope that it comes as announced.