I primarily want to see more of Garlemald, particularly the elements that are more along the lines of Regula.

I want to see more Raen as I feel like they're very poorly represented at the moment. I really wish they'd shelved Roegadyn in Othard and given us Raen in their place instead.

I want to see more Duskwight stuff, though I fear we've missed the window of opportunity for that to happen.

I want to see more of the darker elements of the protagonists and city states.

I want to see more conflict between the protagonists. I want to see some of them come to loathe and even betray each other. It'd feel more naturally them always coming to agree and tolerate one another, I feel.

I want to learn of Varis' reaction to his best friend's demise. How does he feel about it? Did the news cause his cool and aloof visage to crack and crumble? With the Echo being a thing, there's an easy enough route there to have more of their relationship explored.