The date for the December concert in Sydney looks to have changed from Friday 2 December to Saturday 3 December - at least according to the Sony BMG Australia website. I have also now updated the original news item which lists all the dates here at funkin.com with this correction.
Ticket pre-sale starts on Monday 5 September through the Visa Entertainment website (which is still listing the Sydney concert as 2 December!). In addition to the ticket pre-sale, the Visa website also says:
To celebrate the Visa pre-sale of Jamiroquai tickets Sony BMG are offering Free downloads of unreleased Jamiroquai tracks to Visa cardholders.
In addition Visa cardholders will have access to exclusive limited edition signed Jamiroquai merchandise, not available anywhere else.
Available from 5th September 2005