pakraticus: As far as I know, GNOME *didn't* switch to a new session protocol. There are plans to eventually do that, but, for the time being, the session protocol continues to be XSMP. You may be confused by the fact that the GNOME 2.24 release notes mention DBus for session management, but, as far as I understand it, this is just an interface to control the session manager itself (start the shutdown sequence, for example).
pakraticus: As far as I know, GNOME *didn't* switch to a new session protocol. There are plans to eventually do that, but, for the time being, the session protocol continues to be XSMP. You may be confused by the fact that the GNOME 2.24 release notes mention DBus for session management, but, as far as I understand it, this is just an interface to control the session manager itself (start the shutdown sequence, for example).