Is the menu so much different from current gnome menu? Apart from the rounded corners and a bit of transparency?
What impressed me was the way they talk about the underlying meaning behind the colours and "materials" - I've never heard these discussed in this depth:
QUOTE
Tans and Beige colours are for areas that contain content or are unimportant - as they do not distract the eye. Browns and Chocolate are for elements farther away from content, contain important content, or selected widgets. Orange colours are for active widgets to show either what you are interacting with, or what option you have selected.
Glossy items contain options that are non-dangerous/pre-made, polished tools, usually only containing things you can easily undo. Plastic surfaces will contain anything that we can't guarantee is safe.
They're really making an effort to produce a simple, unified set of ideas behind it.

And yay for scalable svg goodness, I had only heard about that with regards to KDE4, I hadn't heard any gnome references.