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Seb-wejem
Another cool thing about the PF2e system, is that you can add archetypes right at the start to fit a theme. I was looking at an adventure (path?) outline where everyone has some mystic ability so they grant bonus feats to fit the theme. In this case everyone starts with either the druid or wizard archetype. You could do the same with something like the pirate archetype or maybe everyone is working as a watchmen solving crimes so they all get the Investigator achetype. It's a cool system.Yeah, PF2e multiclassing and subclasses look great, though I haven't played them. One thing that struck me about them when I first saw them was how well the subclasses let you express different concepts or themes. And, if your concept doesn't work with the existing options (want an Artorias-like armoured fighter with a wolf companion?), you can pinch a feat from another class for a small cost.
Since OneDnD needs to be backwards compatible, I doubt that there will be any major revision to multiclassing. Perhaps extra attack from the base class will stack like spell slots allowing for a FIghter 2/barbarian 3 to have extra attack. I'm not sure what else would work like that though.