"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
AirPods and AirPower: Everything We Know
iPhone 6 and 6 Plus Models Popping Up in China, Vietnam Ahead of September 19 Launch
According to Dan Tri [Google Translate] an iPhone 6 and 6 Plus were spotted in a Red River restaurant in Vietnam by an AP reporter, who confirmed the legitimacy of the devices.
The reporter is said to have tested features like Messages and Siri to confirm that the devices seen in Vietnam were real, and Dan Tri snapped several photos of the two phones. The images show off the size difference between the two models and how the devices fit into a pocket.
Dan Tri also shares some details on the two new devices, suggesting that despite the size increase, the iPhone 6 Plus is comfortable to hold and feels like "a miniature mini iPad." The cameras, though protruding, are not much of a hinderance, and two phones are "fast" and quick to open apps.
iPhone 6 models have also appeared in China, with users on the MacX.cn forums sharing several photos of the devices.
Apple was unable to keep a tight rein on the iPhone 6 and 6 Plus this year, with several parts leaking out ahead of the iPhone announcement. Enough parts leaked, in fact, that Feld & Volk was able to assemble a functional iPhone well ahead of release, and the weekend before Apple unveiled the two devices, a fully functional version of the 4.7-inch iPhone 6 was shared by a Chinese user.
The iPhone 6 and iPhone 6 Plus will be in retail stores beginning on Friday, September 19. Early pre-orders placed on September 12 will also begin arriving on that date, though a few lucky customers often get their devices delivered early due to shipping errors and the logistics of delivering hundreds of thousands of devices simultaneously.