A couple weeks ago, the Water for Elephants Facebook Page posted the WFE Tentative Premiere Dates and Australia was included.
Sunrise just confirmed that Rob is going to Sidney and the Premiere is on May 6th.
RP Australia "Sunrise just confirmed that the WFE premiere is happening in Sydney on 6 May 2011. Rob’s also going to appear on Sunrise and they are giving 2 people the chance to walk the Red Carpet with Rob! Details to follow in a few weeks."