Apple has started to ship out pre-ordered iPhone 4S units to customers. Earlier today, the company announced that the device reached one million pre-orders in just 24 hours (nearly double that of the iPhone 4!), so there will likely be shortages as supplies run out. Make sure to order soon as the current shipping estimate is 1-2 weeks.
Deliveries are expected to arrive on the 14th as promised, but some lucky users may find the device on their doorstep sooner.