Ubuntu has reciently announced the release schedule for the new version of Ubuntu (9.10) due in October of 2009. The schedule is as follows:
May 14, 2009 » Alpha 1 Release
June 11, 2009 » Alpha 2 Release
July 23, 2009 » Alpha 3 Release
August 13, 2009 » Alpha 4 Release
September 3, 2009 » Alpha 5 Release
September 17, 2009 » Alpha 6 Release
October 1, 2009 » Beta Release
October 22, 2009 » Release Candidate
October 29, 2009 » Ubuntu 9.10 Karmic Koala Final Release