Yes, I'm not active within GNOME to know how they release software.
I honestly do not understand several of GNOME’s release approaches: I do not understand how GNOME seems to rush to unstable dependencies (GNOME 3.0 required a beta version of NetworkManager 0.9, to name a 4th example, – a NM version KDE Network Management was incompatible with because, well, NM 0.8 was the stable one at that point. To make matters worse, the choice between NM 0.8 and 0.9 was exclusive, so installing GNOME 3.0 broke KDE Network Management and the GNOME devs didn't even care) as well as I do not understand why the GNOME devs think that only a single bugfix release is enough in each cycle (there is only GNOME 3.4.1, no 3.4.2 etc. – in contrast KDE released SC 4.8.5 recently). I do not understand why that single bugfix release is not even mentioned on http://www.gnome.org/news/
So yeah, there is a whole lot I do not understand about GNOME but I doubt that GNOME's release process is pretty standard…