SO awesome. Thanks for showing some screenshots. I looked at several reviews which never even mentioned this feature (even though it's in plain sight).
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You are using Dark Mode with the Dynamic wallpaper which will do nothing. Switch to Normal Mode and then choose Dynamic wallpaper for it to be of any use.
You can only use the dynamic wallpaper if you're in Light Mode? I understand that the UI has to alter, but I don't see why keeping it dark should force the wallpaper from altering. Well, anyway... not a huge deal.
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(Ignore the gap in the sidebar, it's not a bug, I just Photoshopped them out as they're personal files.)
It would be nice if the colored accent were to appear on a given selected Finder pane.
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Desktop Stacks is becoming a much used and much loved feature already. Gotta love Apple for this. This is bringing me smiles each time I am using it.

[doublepost=1528176706][/doublepost]Something that might be of interest to people.
Dock now has Recently opened Apps. Don't know how many can it hold.
That is a MUCH more attractive 3D effect on those buttons. The utter flatness of the current ones is disgusting.
EDIT: or, perhaps, does it appear that way simply because the dark appearance makes things look more dramatic?
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It seems that buttons look less flat with dark theme only. With light theme, they look same to me.
That is what I was thinking as well: the dark appearance makes the shadows look more dramatic. Well, either way, it looks substantially better.
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Here is the new login/lock screen. Not hugely different but more optimized for retina displays. Profile picture is bigger and higher resolution, background isn't blurred, fades in and out, and the buttons are a bit different.
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Inkserver is still 32 bit.
[doublepost=1528178005][/doublepost]There is also a new Legacy Software pane in System Information for things that need to be updated to work correctly in 10.14+
Good—good. Apple is actually going back to their older roots with some of these changes: accent colors; no stupid blurred login screen; software-updater back in its original location (Sys Prefs).
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Thanks for being the first to show them all! All those n00b tech-reviewers couldn't do such a simple thing as this (and they also left out several good features in their reviews, mainly focusing on Dark Mode).