There is probably more than one "next iPhone." Rumors have it that there will be two new models as Apple responds to the massive demand for bigger phones. The exact size has been heavily debated, but most sources have come to believe that one upcoming iPhone will have a 4.7-inch screen, the other a 5.5. Supposed leaks of both models show a device that looks a lot like the latest iPod touch, with a thin profile, curved edges, and a protruding camera bulge.

The handsets depicted looks to be thinner than ever (as little as 6 millimeters thick), with a rounded look rather than the squared sides on the 5S. One particularly popular photo shows gold, silver, and space gray models, each with an aluminum back broken up only by two horizontal stripes for the antennas instead of glass on the top and bottom.

Apple’s new sapphire production processes could mean the new iPhones could have new types of displays in addition to new lenses and buttons. At least one reputable source says they’ll have curved displays, too, but that’s debated all over. Leaked photos of what's said to be the next iPhone do show that the face of the device has tapered edges, which may be designed to make the phone feel smaller than it truly is.

Apple’s history says the 5S will remain on sale, and there’s no indication so far that Apple’s even replacing it with an updated, device of the same size. It’s possible both new models will be larger, and anyone looking for a 4-inch iPhone will still be buying the 5S. No word yet on what will happen to the colorful 5C, though it seems the likeliest candidate for Apple’s free option.

Gold-9to5

The possible three colors of iPhone 6, in dummy form, first reported by 9to5Mac.

It might be more expensive. At least one analyst says that Apple is currently negotiating to raise the base price of the iPhone to $299 with a two-year contract. Apparently carriers have thus far said no, but in a market where many people feel like innovation has slowed down, Apple could have the hit of the year in store — and that may give it the leverage it needs to charge whatever it wants. Presumably the 4.7-inch version will cost no less than $199 on contract, while the larger, 5.5-inch model would carry something around a $100 price premium.

The 4.7-inch model will probably go on sale first. Several reports suggest Apple is dealing with production issues on the larger model, which could push its release back as far as early 2015. But the consensus is that both models will be announced at Apple's event on September 9th, with the 4.7-inch model shipping first.

It’s probably called the iPhone 6. That’s not exactly a controversial guess, and Apple does have some history in naming differently sized products the same thing, as with the MacBook Air. But it’s not impossible that Apple will repeat what it did with the iPad or MacBook, eschewing the number scheme for names like Air, Mini, or Pro. It’s hardly going to call either of the largest iPhones ever "the iPhone Mini," but some reports suggest that the 5.5-inch model may be called the "iPhone Air" because of its super-thin profile. Other observers have suggested a possible "iPhone 6" and "iPhone 6L" naming scheme (with L denoting "large").

This picture from nowhereelse.fr of what's supposedly a leaked rear case is one of a scarce few images said to depict the larger, 5.5-inch iPhone 6.

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