A little bit late but I looked through the video in this thread and one from linus tech tips from a week ago and there seems to be good and bad things.
Getting direct storage support from the xbox features seems really nice and auto HDR could be cool if they work well.
The general design is for now something that I'm not too keen on but I turned around on windows 10 after using it for a while. There are some removed features that might need to look into more to see how much they will affect my usage.
There are some nice ones though like:
*Windows groups in taskbar (might take a while to get used to but It seems like something that would be really useful),
*Snap layouts alternatives based on your screen is something that I have been wanting in windows for a long time. I have tested some third party ones but found them to be buggy, ugly and/or bloated with stuff I don't need. So just nice with a limited but clean standard alternative.
*Disconnected and reconnected screens having windows restored the way they were before is for me something that windows have been lacking in specifically as display port screens are disconnected every time they are turned of which has jumbles my layout more times than I can count.
Also being able to run android app directly in windows could be really nice (only amazon app store have to check that out). As of now I don't use most apps on my windows pc but this could change some of that.
The biggest worries is what specific programs and setting that I like are gone and privacy and thanks to these I will definitely wait before potentially getting it.