There are some change in this release. New GNOME 3, Kernel 4.4. MeMenu and lot more. You can attach with you social networks without login in those sites.
Learn more from http://www.ubuntu.com/testing/lucid/alpha3
How to upgrade from Ubuntu 9.10 or 8.04? It's very easy
Just type the command below in terminal
update-manager -dUpgrade manager will open instantly.
Look at the picture, there are 'UPGRADE' button in the right side. Press it and follow the onscreen instructions.
Want to download now? Then visit this site to download 'Desktop', 'Server' or 'Netbook' CD Image.