it's a desktop environment, it can be part of any distro you want, especially when an upgrade hits the decimals

Sure. But for now only Fedora 21 and ArchLinux actually release this in their official package repository because they're both very upstreamy Linux distros. You won't be able to install this without fiddling with PPAs in Debian or Ubuntu.

Gnome 3.14 appears to be the default desktop environment in Debian Unstable. Unstable is subject to change and occasionally things stop working for a bit but many people find it acceptable for non-critical use.