The Ubuntu team is already planning for the release of Ubuntu 11.10, it will be released on the 13th of October 2011.
Here is a list of dates when the Alpha and Beta versions will be released.
Release dates:
June 2nd 2011 – Alpha 1
July 7th 2011 – Alpha 2
August 4th 2011 – Alpha 3
Septemer 1st 2011 – Beta 1
September 22nd – Beta 2
October 13th 2011 – ubuntu 11.10
Complete Ubuntu 11.10 release schedule
Ubuntu 11.10 is to be called Oscillating Ocelot but this is unconfirmed…
Ubuntu 11.10 named ‘Oneiric Ocelot’