There must be a way. Otherwise the samples they have shown in the keynote of the landscape mail with the split view or the "enhanced" CNN sample app would never work as in the default mode outlined in this infographic, the screen can't possibly offer any more real estate for UI than the smaller screens, but the samples in the keynote were clearly showing more UI content.
The samples with the wide split screen are rendered at 1242x2208 (3x 414x736, which is larger than any other iphone which is either 320x568 or 375x667) - and then downscaled. My question was really about whether is it possible for software to render framebuffers at 1080x1920 (3x 360x640) - perhaps bypassing UIKit completely.
Hunh? Developers work in terms of the "points" described in the first image.
The 6+ has an extra 39 points in height and 69 in width the 6; about 10% more real estate in each direction. Sure, it's not that much, but it's not nothing. It's an even bigger jump over the screens of the iPhone 5 and 4.
