QuickBooks 2013 will be here September 24. However, you can now buy QuickBooks 2012 at a big discount. You can then get Intuit to give you a "free QuickBooks 2013 upgrade" for $14.95. You might even then later sell your unused QuickBooks 2012.
CORRCTION:
An online upgrade is free. The $14.95 only applies if you want the CD.
This year the discount is especially large because of the price increases for QuickBooks 2013 Pro and Mac. DO NOT MISS THE SEPTEBER 23 DEADLINE FOR YOUR PURCHASE.