It's definitely 'big news' for all the reasons Graeme has mentioned.
There are a number of other factors which, I think, make it big news as well.
First, it's another nail in the coffin of homophobia in Australia. (well, maybe a thumbtack, as the corpse in question refuses to be truly laid to rest) - lol, forgive the 'living dead' reference.
Second, it's come at a time when a politician is again proposing a Federal decision/vote on same sex marriage, and reinforces the broad acceptance by the general public for GLBTI issues in politicians' minds.
Also, it's big news because, as a number of commentators have affirmed, it will undoubtedly be a help to young people struggling with their identity, even to the extent of saving lives.
And, of course, it shouldn't be big news.
The tragedy is that it is. That's the 'big news' we need to think about.