Ubuntu 14.10, which is codenamed the Utopic Unicorn, is currently penciled in to ship on 16 October. For meeting a 16 October release goal, Ubuntu 14.10 is planning the first alpha for opt-in flavors in late June, the second alpha in late July, the Debian import freeze on 7 August, the feature freeze on 21 August, and the beta freeze on 28 August. The UI freeze will come on 11 September, documentation string freeze on 18 September, and the final beta on 25 September. The kernel freeze for Ubuntu 14.10 is due for 2 October and the final freeze ands release candidate on 9 October.
Ubuntu 14.10 should be a rather exciting cycle for new developments given its post-LTS status, a big focus on convergence and Unity 8 with Mir, early systemd integration, and many other changes planned for development over the next six months.
The latest official Ubuntu 14.10 "Utopic Unicorn" release schedule can be found via the Ubuntu Wiki.