Really glad to see the list features more fully implemented, it's what kept me from using the previous beta as a daily driver. I'll be testing this one out for a bit :)
One thing I noticed though after my first few minutes of poking around is this: nice feature of being able to auto-download artist images or just use an album cover, I like that. What I don't like is that some images downloaded didn't make sense (I know this VERY, VERY, VERY likely cannot be fixed, that's not the issue), and for that reason I wanted to turn that feature off again. Now however I'm stuck with these album artist images, or no nothing. What I'd like is prehaps a feature to remove the album artist image cache or something, seperately from the ALBUM image cache. Either that or perhaps the option to go back to using an album cover. Just really some way to go back to the original setting, without having to re-find/redownload the album cover images.
The new UI, and more specifically getting around in it, is going to take some getting used to, but it feels rather intuitive, so that's a plus! Maybe another list variant could be just text and no images at all, as a way to maximize how many things you can view without it being in a grid?