The Curious Case of iPhone 6+ 1080p Display
Apple is losing its advantage over Android regarding market fragmentation.An iOS developer has to support eight different screens these days to cover all devices that will run iOS8:* iPad 2* iPad mini (the last non retina devices, same resolution, different DPI)* iPhone 4S* iPhone 5/5C/5S/iPod Touch 5th gen* iPhone 6* iPhone 6 Plus* iPad 3/4/Air* iPad Mini Retina (again, same resolution, different DPI)Many devs will ignore the DPI differences between the iPad and the iPad mini, but that isn't ideal. 
I think the iPhone 6 Plus should have had a 1600x900 display to keep the DPI in line with the previous phones, however Apple was probably afraid to be compared unfavorably to the Android phones that have 1080p panels.