On Sept. 12, the Yerba Buena Center for the Arts in San Francisco will be crowded by hundreds of Apple enthusiasts as the company is holding a special media event to unveil its sixth generation iPhone, widely believed to be named the "iPhone 5."

At a time when the big event is just days away, leaks related to the so-called iPhone 5 keep on increasing rather than slowing down. Earlier this week, reports surfaced online saying that a video appeared at the IFA 2012 trade show in Berlin, which showed a handset, claiming to be a mockup of the fully assembled Apple iPhone 5. Quite obviously, the handset showed in the video was not active. But now, after a couple of days, another video has appeared which claims to show the device booting up iOS 6.

M.I.C. Gadget reported Wednesday that somebody in China managed to get his hand on the iOS 6-running new iPhone, which was leaked out of Foxconn's Jincheng manufacturing branch. Located in China's northern Shanxi province, the Jincheng plant is considered as the largest precision manufacturing base in the world, iDownloadBlog has reported.

As the report noted, the video (embedded at the end of story) showed a white handset with a taller display, booting up next to an iPhone 4S. The video provided "a good indication of the increased speed of the iPhone 5, courtesy of its rehashed, low-power dual-core variant of the A5 chip, souped up with 1GB of RAM," said the report.

M.I.C. Gadget's report said that the video originated from Chinese technology news website Vgooo.com. Here's how the device was discovered, as explained in the report:

"A tipster tells Chinese tech media Vgooo.com that he has "accidentally" discovered an iPhone 5 prototype when he made a visit to his friend at Foxconn's factory in Jincheng... our sources tell us that each Foxconn worker needs to finish some touch-up cleaning to complete up to 3,000 iPhone 5 back panels every night in recent months."

"When he got his hands-on with it, he could feel the phone is thinner, and it is indeed taller."

Another thing to notice in the video was that the device was not activated as it was yet to be "registered as part of the iPhone Developer Program."

When the demonstrator booted the device up, it showed an error message and got stuck at the charcoal-colored linen introduction pages prominent in iOS.

Was the video a genuine one? Ben Reid of Redmond Pie seemed to be convinced.

"We're fairly confident it's the real deal - despite the rather sketchy story, although I always find it rather baffling that whenever there's a big, world-exclusive, there's never anybody around with a decent snapper to film it," said Reid.

Apple iPhone 5 is expected to have a larger 4-inch screen with in-cell touch technology, a uni-body design and a smaller 9-pin dock connector. The device is likely to run on iOS 6, which would be completely scalable to a larger 640 x 1136 display.

The device will very likely be powered by a much-improved processor. Other talked-about features include 4G LTE technology, Near Field Communication (NFC), 1GB RAM, improved Siri, liquidmetal casing, an 8 megapixel (or even higher) rear camera, a 2 megapixel front-facing camera for video chatting and a much-improved battery life.

Watch the video below: