Canonical has started making its ISOs available Ubuntu Release Candidate – RC 15.10 (aka Wily Werewolf). The operating system is available for testing to find the last remaining ones errors of, with a schedule to be ready on October 22nd where it will be officially released.
Ubuntu 15.10 is currently in the final development stage, which means that after this RC version you won't get any new features and updates, except for critical security vulnerabilities and major bugs that could be discovered during development. duration of the period of consideration of the issue in question.
All Ubuntu 15.10 RC iso - Wily Werewolf, including Ubuntu, Kubuntu, Lubuntu, Ubuntu Core, Ubuntu GNOME, Ubuntu Kylin, Ubuntu MATE, Ubuntu Server, Ubuntu Studio, and Xubuntu, are available at tracker of Canonical so for 64-bit (AM64) as well as for 32-bit (i386).