Otterbox just emailed this to customers who ordered before 8/9:
Dear Valued OtterBox Customer,
Thank you so much for your patience with your new OtterBox Defender Series for iPhone® 4 order. We apologize about the delay and want to give you an update.
Your order will ship 8/17. You will be emailed a notification when the product ships. This order confirmation email will contain the tracking number of your package.
Thank you for your patience, we appreciate your support!
OtterBox