So it looks like the rumours were true when it came to the launch delay for those in Australia and whatnot. This means that Microsoft will be able to concentrate on their current markets for a week or two longer than was originally planned, as well as hopefully give them a little more time to do the launch right in places like Hong Kong, and Australia.
In Hong Kong and Singapore, the Xbox 360 will now be released on March 16, 2006. In Australia and New Zealand, the new launch date is March 23, 2006.
The new launch dates have been set due to unprecedented global consumer demand stemming from challenges in ramping supply for a complex product like the Xbox 360. This is a short term manufacturing challenge and steps have been taken to increase supply to meet the strong consumer demand for the console.
Source: Blog.MSDN via Xbox360fanboy