Gnome 3 has finally been launched after what seems like years! So long in fact that Canonical/Ubuntu has decided to drop it from their upcoming version. But even if you don't want to wait for the major editions to release it in their next versions, you can install it right now.
This is probably one of the biggest changes to the Gnome interface for the past few years, so it's a big change.
Have a look at the following to see how to install it: