The schedule of the release of Ubuntu 13.10 Saucy Salamander with exact dates as mentioned in wiki are as follows:

Alpha 1 - June 20, 2013 (not for public)

Alpha 2 - July 18, 2013 (not for public)

Alpha 3 - August 1, 2013 (not for public)

Beta 1 - September 5, 2013 (not for public)

Final Beta - September 26, 2013

Final release - October 17, 2013

Mark Shuttleworth was proud to announce that Ubuntu 13.10 is named Saucy Salamander and it will become the 19th release of the Ubuntu operating system.Ubuntu 13.10's (Saucy Salamander) main target will be to enhance Ubuntu Touch's mobile UI (user interface) with new applications, a new SDK, and a gorgeous clean interface.Canonical will no longer allow users to test Alpha releases of Ubuntu. Only the Beta version will be available for testing, which will be released on September 26, 2013.Download Daily Builds of Ubuntu 13.10 Saucy Salamander