Also mentioned in The Age today.
http://www.theage.com.au/sport/austr...5nb8.html#poll
An FIA F1 standard track will need to be at least 5km long and considering Calder is currently around 2.5km long they've got to find another 2.5km of track space plus room for spectators.
The original post and link has Bob Jane saying the GP wont move from Albert Park so who knows.