So the book is to be released on the 30th of October 2012. Now in Australia it is currently 4.33 pm on the 30th of October 2012.
According to timedate.com it is 10.33 pm on the 29th of October 2012 in Seattle, Washington, where Amazon's headquarters are apparently located.
So will the book be released at Midnight Seattle time, or 7am Seattle time? or 9am Seattle time (aka office hours)?
Now as of 6.17 Australia time, but 12:17 am in Seattle, I can say that it has shipped.
Which answers the question.