According to Microsoft, Kinect Voice control for games will work from tomorrow, most likely via an update. For all entertainment controls, however, we'll have to wait until mid-December. This is still in line with Microsoft's promise that Australians would have Kinect Voice control by the end of the year, but still far outside their initial estimates.
More details as we get them.
EDIT: We called to confirm with Microsoft, and the Kinect voice controls for games are actually the voice controls that are game specific — like in Forza 4. The proper update we're looking for comes mid-December via an update. Sorry for any confusion.