Canonical has added some of the GNOME 3.16 packages in their Ubuntu 15.10 Wily Werewolf system, but the changes will not be spotted by the regular user.
The problem is not with the updated applications, but with an upgraded GTK version, which may really affect the system. Before implementing apps by default, Canonical patches them to work well with Unity, basic on the philosophy that an app that works well does not need to get updated.
Unlike other systems, that use the latest packages of GNOME (if GNOME 3.14 is installed, for example, all the gnome components are upgraded to version 3.14), Canonical does not has this habit.
Until now, the below applications have been updated to version 3.16 only: GNOME Keyring, Zenity, Orca, Eye of GNOME.
As a reminder, Ubuntu 15.10 Wily Werewolf, based on Debian 9.0, will be released on the 22nd of October, this year. For now, we only know that Ubuntu 15.10 will be using either Kernel 4.0 or Kernel 4.1, Kernel 4.0.4 being already implemented in the daily builds.