Ubuntu GNOME, an Ubuntu-based Linux distribution that ships with GNOME Shell by default along with other GNOME applications that aren't available by default in Ubuntu, is now an official Ubuntu flavour (starting with 13.04).
The news comes from the Ubuntu GNOME mailing list, where it is specified that there won't be a 13.04 beta 1 release this week, but there should be a beta release at the end of the month and daily images should be available within a few weeks. This should make it easier to install and test because right now, there's no way of getting Ubuntu GNOME except for installing another Ubuntu 13.04 Raring Ringtail flavour and then install the Ubuntu GNOME meta packages.
Ubuntu GNOME 13.04 will be released with GNOME 3.6 because Ubuntu 13.04 won't ship with GNOME 3.8 for the most part and since this is now an official flavour, it can't ship with a PPA, but you can use the GNOME 3 PPA which should get the stable GNOME 3.8 once it's released.
Also, the official name is now "Ubuntu GNOME', without "Remix" which has been used in the previous (unofficial) release:
The official name is now "Ubuntu GNOME"; no "Remix", no "Edition". I like the simplicity of this name and the GNOME Foundation Board has made it clear that we are not welcome to use derivative names like GNOMEbuntu as our official name.
- Jeremy Bicha @ Ubuntu GNOME mailing list
We'll let you know when the Ubuntu GNOME beta is released and when you can download the daily builds.