This once again shows the beauty of KDE’s Phonon. Want to test GStreamer 1.0? Great, just fork the existing GStreamer 0.10 wrapper, modify and compile it against GStreamer 1.0 and all Phonon applications use GStreamer 1.0.
Why didn't you time GStreamer 1.0 to be ready for beta1 releases of GNOME? Then you'd have the entire beta period of GNOME to also fix GStreamer bugs and have a perfect point release ready for GNOME 3.x.0.
I wouldn't even bitch at all if the Gnomes didn't always shout how enterprise-ready they are and how unstable everything else supposedly is (usually pointing fingers to KDE).