As the title suggests, Canonical has published the release date for their next Ubuntu, Ubuntu 13.10 Saucy Salamander.
It looks like Ubuntu 13.10 Saucy Salamander will be officially released in the 17th of October. The first Alpha is scheduled for the 27th of June and the second Alpha for the 25st of July.
Cannonical also has in plan to release an updated version of Ubuntu 12.04 Precise Pangolin LTS, the third one, in the 15th of August.