Haven’t had much time to test Pro 6.8 in between work and testing the CS Forms beta so this feedback may come a little late.
Love the light-dark support, however you must specifically know about it to use it. The color picker UI gives you no hints that you can use light-dark values. And if you do use it then the color swatch only shows the first color of the pair, again no visual clues there. Could this be enhanced so that the swatch shows both chosen colors so you can instantly see the chosen light and dark color variants in the palette and the picker?