I am a Wing Commander fan in Western Australia and it would appear that the movie won't be released here until September 23. I believe it was only released in Victoria on the 16th.
Regarding advertising, back in about March april I saw a poster at one particular complex and that's it. Posters have only begun popping up at all major theater complexes in the last few weeks. There have been no ads on television and I saw the trailer once at a screening of Star Wars. I saw Star Wars four times at four different theaters and the trailer was only played at one of them. A couple of weeks ago a radio station played a commercial for the movie, but was more of a promotion for a competition where you could win tickets. Advertisements in the paper haven't even begun yet and the movie is supposed to open in four days! I will let you know if the movie actually does open here on the rumored date.