I think this could end up anywhere in the 85-93 range. I'll go with 89 but hope it gets into the low 90s - I have a feeling it's going to suffer some unfair comparisons to Breath of the Wild, and will receive some criticism simply because it is (unashamedly) a complex Japanese RPG. I can also see some complaints around the British voice-acting and character models at a few outlets.
That being said, the positivity around Switch plus the slightly lower reception (versus XC) for XCX and the fact this is Switch's first major JRPG might all work in XC2's favour and see it get into the low 90s. I'm really looking forward to it, anyway, but it'd be good to see an ambitious Japanese RPG turn out well enough that it gets a really positive reception.