I remember GTV trialled having their weekend bulletins read by someone standing up in 2008-09, rather than sitting down, though I can’t remember why it was introduced.
This appeared to cease once GTV got a new set in August 2009 (when they got a set exactly the same as what Sydney got, and what Brisbane would get a month or two later). However, I do remember the standing up format continuing intermittently only for major news headlines (or sometimes the first story of the bulletin) after that.
I remember when GTV implemented the 2006 graphics, the background (of the live Melbourne CBD) lasted only one year, then in 2007 they introduced a wooden desk and had the headlines blend into a static Melbourne background.
At that time, HSV introduced the twisted metal set with a live Melbourne background, so as to give it consistency with its Sydney counterpart (prior to then, the Morning and Afternoon News came out of ATN and HSV, respectively).
FWIW, Nine dropped the “National” from Nine News on October 20, 2008 as part of a relaunch of its news service (which by that point was a distant second behind Seven).
From memory, reporter’s started signing off on their reports as just ‘Nine News’ prior to the actual rebranding of the news service. I dont think there is a clear reason behind it though, maybe the rebrand was pushed back and reporters were already using new sign offs