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A video showing what appears to be an engineering sample of a rear casing for Apple's next-generation, 5.5-inch "iPhone 6" surfaced earlier this week from Japan, showing a rounded unibody design and a two-part Apple logo.
The casing, published by Japanese blog Mac Otakara, largely matches up with previous leaks and rumors. A rounded flash and microphone hole flank the rear-mounted camera, and the sides move away from the iPhone 5's flat layout to a more rounded form factor.
The interior sports a number of attachment points and screw holes, as well as plastic fixtures near the top and bottom. Additionally, the Apple logo found on the upper part of the back panel is cut out, suggesting Apple may use the location as an antenna window as the company does with the iPad.
It is worth noting that Mac Otakara makes no mention of the provenance of the new part. It was first seen alongside a number of other mockup iPhone 6 units purchased from Chinese marketplace AliExpress, suggesting that it may simply be a speculative part produced by a third-party seller.
No matter its final industrial design, the iPhone 6 is widely expected to come in two versions — one with a 4.7-inch display and a larger, 5.5-inch "phablet." Other features rumored to be in the offing are a new, 128-gigabyte capacity variant, optical image stabilization, and a faster "A8" CPU.