Well, since it's taking a bit long for Nintendo to reveal any info I expect to see a few more colors available, like purple, orange, pink, yellow, red, or even other animal-like solid colors like what your favorite villager has. Not just human styled eyes, but animal shaped eyes!
I want eyes that more accurately look like my own. Give us hazel eyes, please! Brown is ok, it works I guess... and perhaps asking hazel would be too much with how Animal Crossing typically is. But since this is gonna be on the Switch... I think that having more variations would be awesome! I like the color slider idea, and it's clear my bias is showing about eyes... I hope we get this kind of option. Color slider that has the ability to get to hazel would be perfect!