Ubuntu 11.10 Alpha 1 with code name “Oneiric Ocelot” has been released comes with Gnome 3 desktop also comes with Unity 2D instead of classic Gnome desktop incase you don’t have enough hardware specifications for your machine.
Some of the key packages making their first appearance with this Alpha 1 release are:
Unity taking place with many gnome 3 applications like Nautilus file manager and gedit text editor. By default Ubuntu 11.10 don’t comes with Gnome shell but you can install it if you want
Gnome shell already available on Ubuntu 11.10 repository so you are not have to add extra repository simply run this command on the terminal.
Download Ubuntu 11.10 Oneiric Ocelot Alpha 1
Ubuntu 11.10 Alpha 1 Release announcements
Also check Release Notes for more informations and download options for Kubuntu, Xubuntu and Edubuntu.