If you live in Australia you can get it already. Those in the United States will likely have to wait until midnight for their pre-order.
From bestselling author Walter Isaacson comes the landmark biography of Apple co-founder Steve Jobs. In Steve Jobs: The Exclusive Biography, Isaacson provides an extraordinary account of Jobs' professional and personal life. Drawn from three years of exclusive and unprecedented interviews Isaacson has conducted with Jobs as well as extensive interviews with Jobs' family members, key colleagues from Apple and its competitors, Steve Jobs: The Exclusive Biography is the definitive portrait of the greatest innovator of his generation.
You can get the book from the iBookstore here, Amazon sells it for $17.88. It's likely that the Kindle edition will be available at midnight as well.