Me likey !.
In particular I like how the icons are bigger - particularly the volume slider as well as volume muter icon.
I know we had a raging debate on whether large icons are space wasting or not, but while using my N810 in my car - that single Volume muter icon is a source of immense frustration for me. Its like a pin point and needs me to click with my nails literally and that too while driving you can't even be sure whether its a muted icon or not.

Overall I like the direction of the N900 Fremantle GUI design.