Honestly, because Larian drew specific attention to explaining races and classes in their PFH announcement, I do actually think they'll show something surprising, since at this point why not spring that as a surprise at the PFH if it's only thing we were all basically expecting? I'm with Red Queen though in that I think we'll only see one extra race and one extra class. What that race and class might be? Aasimar feels like an easy choice for a race since they're basically shiny humans. Genasi are another option if they wanted to get more ambitious, but I don't think there's any chance of warforged and I'm kind of surprised people think Gortash's presence indicates otherwise. Speaking of which, I do think if they're gonna include another class, artificer is the one I'd expect. Either that or psychic because it's thematic.
Another option I do think is realistic though is that rather than including a non-phb class, is them just give every class an extra subclass.
