Future Ubuntu 11.10 right now named Oneiric Ocelot Alpha 2 is released for testers as well as developers who would like to give it a spin.

Download the image from here for testing. Some new features for Alpha release include :

• Newer packages showing up ready to be installed like Firefox 5, Thunderbird 5, A Mesa 7.11 snapshot, gcc 4.6.1 compiler and Linux kernel 3.0-rc5.
• Other wide range of software updates that have not yet been tested.

Cheers.