The iphone 6 resolution is said to be 1,334 x 750 pixels according to Ming-Chi Kuo (an analyst who has got certain predictions right). This gives the 4.7" iphone a ppi of 326. He has also stated that the 5.5" model would have a resolution of 1,920 x 1,080? How plausible is this?
Doesn't make sense at all. The whole reason the first gen iPad Mini wasn't Retina or higher resolution is because they wanted to support the same resolution as the iPad 2, which was 1024x768. And now when they updated the Mini to Retina, they brought the exact same resolution as iPad 3/4/Air at 2048x1536. Apple cares to make things as easy as they can for developers and updating their apps.
When the iPhone 5 brought a 16:9 display with the resolution of 1136x640, it meant that the developers could keep the same app width, while just making it taller. While this did take some work to update the UI, it wasn't too hard for many developers, and since most developers have Android apps as well, 16:9 wasn't hard to support on iOS.
Knowing how Apple supports its developers and cares about backwards-compatibility, it doesn't make sense to have 2 different resolutions for the 2 rumored iPhones.
It doesn't make sense to have one with 1334x750 and the other with 1920x1080. If that's true, then developers will have to support 4 different resolutions just for iPhone! That's completely ridiculous, and it's very un-Apple to be honest.
Knowing Apple, I think they'll do what they've done to iPad Air and iPad Mini Retina. They'll have the exact same specs, same screen resolution, probably 1920x1080, call it Ultra-Retina or something, and make the bigger more expensive. This strategy has worked for MacBooks, it's working for iPads, and it can work on iPhone.
Making the smaller version worse sounds like something Samsung would do, but not Apple. Apple treats its products much more maturely, and realize that sizes are demanded by different markets, yet everyone wants a quality Apple product.
