"Ubuntu's next release is planned for mid-October, as usual, with the codename 'Gutsy Gibbon.' In case you have no idea what a gibbon is (get used to it- Ubuntu 11.04 might be named 'Naughty Nightjar'), Wikipedia can help.
"Gutsy is going to be another cutting-edge release, with AppArmor installed and parts of KDE 4 in Kubuntu--not to mention a full Compiz Fusion desktop by default. A rumor suggests Firefox 3 will be included. Don't worry, though, KDE 4 will be optional, GNOME will be at the stable version 2.20, and the planned kernel version is already stable--they're using 2.6.22..."