Hey,
I was in my LDS yesterday and they have the Luna on display where the Terra used to be so they are definitely available in Australia.
Ironically though, on the Oceania Uwatec Web site there is no mention of the Luna and they still have the Terra proudly displayed. I guess, the web updates may take a while to dribble down hill to the southern hemisphere
Anyway, regardless what anyone states, I love my Terra. Being that I have all of my dive logged in the Smarttrack software, it would be a pain in the butt to move to a different platform. That and the compass are probably the big reasons for going with the Luna when my Terra packs it in.
Cheers
Rainsey