Summary:
As far as I can see from the screenshots, what we have is:
OS 3.9, with Birdie, VisualPrefs and MagicMenu, all integrated into
the OS instead of being hacks, plus the following which seem new to
me, I'm not sure if they are entirely new or not:
Rounded menu corners.
Bitmap patterns in certain OS gadgets, like buttons, scrollbars etc..
This one could already be done in MUI, but not in the OS AFAIK.
I like it. I'm not that fond of the particular styles they chose for
the screenshots, but I figure it will be configurable enough to make
it look like what I have now, and I *like* the look of what I have
now. Plus the new features mentioned above look nice, I'll use those.