If @3x is a thing, wouldn't 1080p be kind of an Occam's Razor resolution for a 4.7 device?
Besides the fact that 1080p is common and marketable, it would be the perfect resolution to mirror to an AppleTV.
And having both the 4.7 & 5.5 phones be @3x would motivate developers more to add @3x assets. If the 5.5 phone is the only @3x device in Apple's lineup for a while, it might be tempting not to invest.
And then a 4K (3840x2160) at @3x might be perfect for a 12.x inch iPad. That would mirror perfectly to 1080p or 4K TVs. It would be 16x9, which is hard to imagine, but mirroring to projectors might be more important for a 12" iPad than the smaller ones? I could really see it used in presentations and education.
I say go with the standard resolutions when in doubt, even though there is no real Apple precedent.
Besides the fact that 1080p is common and marketable, it would be the perfect resolution to mirror to an AppleTV.
And having both the 4.7 & 5.5 phones be @3x would motivate developers more to add @3x assets. If the 5.5 phone is the only @3x device in Apple's lineup for a while, it might be tempting not to invest.
And then a 4K (3840x2160) at @3x might be perfect for a 12.x inch iPad. That would mirror perfectly to 1080p or 4K TVs. It would be 16x9, which is hard to imagine, but mirroring to projectors might be more important for a 12" iPad than the smaller ones? I could really see it used in presentations and education.
I say go with the standard resolutions when in doubt, even though there is no real Apple precedent.
(edit to add content)