From the official Iron Maiden website:
Maiden are delighted to announce that they will return to Australia in late February/early March 2011 to headline Australasia’s greatest Metal Festival, Soundwave. The dates are –
26 Feb 2011 - Brisbane, Showgrounds
27 Feb 2011 - Sydney, Eastern Creek Raceway
4 Mar 2011 - Melbourne, Showgrounds
5 Mar 2011 - Adelaide, Bonython Park
7 Mar 2011 - Perth, Steel Blue Oval
For full details on Soundwave, stay tuned for official announcements, or go to http://www.soundwavefestival.com/
PLUS Iron Maiden will also play two arena shows prior to the festivals with first ticket access for Fan Club members:
23 Feb 2011 - Melbourne, Hisense Arena
24 Feb 2011 - Sydney, Entertainment Centre
The exclusive pre-sale will take place on Monday 9th August at noon and run through to 5pm Tuesday 10th (local time). The pre-sale is open to all Fan Club members - watch the site for updates later today!
Tickets for these two shows go on sale to the general public on August 12th.