iPhone accessories, mainly cases, are already for sale on Chinese site Alibaba.
There appear to be hundreds available on the site, such as this "Mobilephone accessory for iPhone 5 wallet stand leather case." As is typical for Alibaba, the market is wholesale with large minimum orders.
The image above clearly shows the iPhone 5 bottom with the new speaker grills, headphone jack and dock.
Hat tip to the Wall Street Journal's China Real Time blog.