Canonical has just released the first Alpha of upcoming Ubuntu 10.10 Maverick Meerkat its now available for download. Ubuntu 10.10 Maverick Meerkat will have altogether four alpha releases before the first beta in September 23rd.
Ubuntu 10.10 Alpha 1 still looks very much like Ubuntu 10.04 final, but contains lots of new code. It is not advisable to use this version on productive systems.
Ubuntu 10.10 release schedule:
June 3rd 2010 Alpha 1
July 1st 2010 Alpha 2
Aug 12th 2010 Alpha 3
Sep 2nd 2010 Alpha 4
Sep 23rd 2010 Beta
Oct 21st 2010 Release Candidate
Oct 28th 2010 Final Release of Ubuntu 10.10