Some suggests for appearance

I don't know. I do like Chrome's ability to use extensions for themes. Although you can do that with Edge, it requires sort of manually installing it instead of simply downloading a theme from the Chrome store and being able to reset it to default later on if one doesn't like. On the other hand we can use the Window's color scheme to change colors, but for those that like picture themes like maybe space, the stars, the forest, and there's one on Chrome that has a Halloween spooky misty woods theme, that would be nice. 

Like this one as example: https://chrome.google.com/webstore/detail/into-the-mist-hd-wallpape/dlaclmmkgakhfgehfanfedhbfekicdji

I don't know if they'll change (if it can even be coded?) the inprivate window tab to blue like in original Edge.  

Customizing the new tab page would be cool too. I guess it's a matter of seeing what's installed in each future update especially what pops up in Edge Canary.  🙂