Gnome 3 is a complete redesign of the Gnome desktop environment. I have tried it using an Opensuse live CD and the experience was like wow, it really is something you need to get familiar with in order to get things done.
Some of the most outstanding features of Gnome 3 are:
-They have enhanced the use of traditional virtual desktops. Yes, virtual desktops have (almost) always been there, but not many people took advantage of them. Now, their use is a bit more automatized in the sense that windows are assigned to different spaces, grouping them to make the best use of your graphical environment.
-Minimize and maximize buttons have disapperared from windows. Only the close button remains there. At first it is a bit strange but later on you really enjoy the way windows resize automatically for fullscreen, half screen or floating around. It's great.
Something I do not like:
-There is no traditional menu. Clicking on Applications displays icons for all installed applications. It's something similar to having a million icons on the desktop only that it isn't.
I love clean pristine desktops, I do not like no icons there. What are they useful for anyway? Alt + F2 is the way to go.
Well, this is my initial overview of gnome 3. It is supposed to be included in testing soon. I'll have more time to test it and learn more things about its usage. I'll sure discover new strong points and flaws.