I understand that with GNOME version numbers, you have the odd numbered releases being the unstable in-development series, and the even ones as the stable releases which the odd unstable ones become. So for instance I am currently running Ubuntu GNOME 15.10 with GNOME 3.18, and I installed GNOME 3.18 from the gnome3 and gnome3-staging PPAs in order to get there because Ubuntu GNOME is shipped with GNOME 3.16 due to issues with the release cycles of Ubuntu and GNOME not quite matching up so the latest version of GNOME is ready only after the time GNOME can submit the GNOME version to be used in the next Ubuntu release.
Anyway, as I like to be on the edge with software I'm using I would like to know if there is any way for me to easily upgrade to the GNOME 3.19.x development series? Like is there a PPA or something I can get it with and stay up-to-date easily? And do I have to run Ubuntu GNOME 16.04 in order to do it or can it run on 15.10?