These are some ideas i made up, after some quick looks at the Watch Pro 2.
Main improvements are stackable widgets of the same category (big weather widget with a smaller one, example of the weekly weather with today only weather)
New Music widgets, aswell as customizable widget (being able to upload our own images)
Brightness control, i am aware of the Do Not Disturb option, but this idea is just for brightness control, you set the time and brightness level you want.