We were expecting that Gnome 3 interface will be built in with Ubuntu 11.10.but it wasn't there .But the thing is that we can install Gnome 3 interface without breaking Unity interface. Click to Read more about Gnome 3 here
So how we install Gnome 3 interface in Ubuntu 11.10 ?????
follow the simple step :Open terminal and type (excluding dollar)
$ install sudo apt-get install gnome-shell
Now you can choose the interface to Gnome3 when you login next time to your machine...