AFL have announced that the Swans will play their preliminary final on the Friday (21st) at ANZ, so I guess that means:
Prelim 1, Fri 21/9: Storm v Manly/NQ (AAMI Park/Etihad Stadium)
Prelim 2, Sat 22/9: Dogs v Rabbitohs/Sharks/Raiders (ANZ Stadium)
Should work out well for the Storm as it means they won't be competing for crowds with any AFL, especially as the only game down here that weekend will be Hawks v Freo/Adelaide - not exactly a blockbuster. Although there will be bugger all away supporters so no crowd boost there.