Wayland isn't playing any useful/official role in Ubuntu 12.10 with Canonical's plans for a Wayland-based system compositor having been delayed to a future release, but Wayland/Weston packages continue to be available from the Ubuntu universe archive -- they just aren't too useful at this point. There are the Wayland/Weston packages and some simple demos that can be run from the Ubuntu packages, but the tool-kits packaged for Ubuntu along with other components aren't yet being shipped by Ubuntu with the Wayland support enabled.
Confirmation of the Wayland/Weston version 0.95 bumping can be found from packages.ubuntu.com.
A Wayland enthusiast has now created a Wayland-enabled GTK+ Launchpad PPA for those wanting Ubuntu to at least have GTK+ support that works for Wayland. "Darxus" just rebuilt GTK+ with the --enable-wayland-backend switch and he's hoping to get this into Ubuntu 12.10 as a feature freeze exception. However, for this post-freeze change to happen, lots of people need to test out GTK+ with this back-end enabled. So if you're interested, try out the PPA for Ubuntu Quantal and report your findings in this bug report.
More details are available from the wayland-devel mailing list.
For those wanting to experiment with Wayland/Weston, one of the best ways to do so right now is by running a Wayland LiveCD.