Ubuntu 11.10 Alpha 1 version is now available for developers to download .
How to Upgrade from Ubuntu 11.04 :
To upgrade from Ubuntu 11.04 on a desktop system, press Alt+F2 and 
type in "update-manager -d" (without the quotes) into the command box. Update Manager should open up and tell you: New distribution release ‘11.10’ is available. Click Upgrade and follow the on-screen instructions.
To upgrade from Ubuntu 11.04 on a server system: install the update-manager-core package if it is not already installed; launch the upgrade tool with the command sudo do-release-upgrade -d; and follow the on-screen instructions. Note that the server upgrade is now more robust and will utilize GNU screen and automatically re-attach in case of e.g. dropped connection problems.
Download Links :
Note : This Release is only for developers . Use DVD or USB to install this version .
Ubuntu Desktop and Server :
http://cdimage.ubuntu.com/releases/oneiric/alpha-1/
Ubuntu Cloud Server :
http://uec-images.ubuntu.com/releases/oneiric/alpha-1/
Kubuntu :
http://cdimage.ubuntu.com/kubuntu/releases/oneiric/alpha-1/
Xubuntu :
http://cdimage.ubuntu.com/xubuntu/releases/oneiric/alpha-1/
Edubuntu :
http://cdimage.ubuntu.com/edubuntu/releases/oneiric/alpha-1/
References :
https://wiki.ubuntu.com/OneiricOcelot/TechnicalOverview/Alpha1
Image Link : engadget.com
