We haven't seen much at all. And we've been here before with the last iPhone roll-out. People make counterfeits based off of rumors and put them out as real. There is no disputing this. We may even see major aftermarket companies bet thousands of dollars on a leak.
So, we have all that on the one hand, and one weird form factor case design that's shown up in three or four places now. Not even a phone, just some metal and plastic that are in the shape of what's claimed to be the new iPhone. Oh, it just so happens this weird case follows speculation from someone on a rumor site EXACTLY.
Apparently that guy (if anyone wants to find the post they can)--who was talking about maintaining "retina-ess" with a 4 inch display--nailed the it. He just figured it out. He argued they could just add another row of icons. EDIT: Here's the first mention I find off hand on April 9th at the Verge.
http://www.theverge.com/2012/4/9/2937265/the-4-inch-iphone-5 Most people, I think, made quick note of how it would break every app and didn't take it seriously until the predictable blurry photos showed up. Now most everyone just assumes this is it. (BTW, the blurry photos aren't even all the same design, we can now see there are discrepancies...the noise canceling mic hole between camera and flash, the placement of the front-facing camera.)
If these rumors are true:
-Every app will have to either be stretched, boxed, or ported.
This is simply enough, basically letter box apps that don't update to the new screen size.
-New connector means many existing accessories will not work for this phone.
Very valid point. I know I have a ton of accessories for mine having owned iPods and iPhones for years. The dock connector is outdated in it's current form. they love thinner form factors and the dock connector is in the way. They will make a smaller one. They released a $10 adapter for the new magsafe connector so they could do the same thing here.
-Mini-iPad rumors, which now have reached credible sources like the NY Times, wouldn't use this new aspect ratio for some reason.
If the rumors are true, it's the same resolution as iPad 1 & 2 and aspect ratio. iPad 3 uses the same aspect ratio as the previous generations. The phone doesn't factor into this at all.
-Cook's "one screen size, one resolution" given at D10. He was talking at the time, and didn't mention the future, but now we're supposed to believe not only the size is changing, but also the resolution....even more, the aspect ratio?????
Every CURRENT phone. No where does he mention future plans. IF they change the screen size, within a couple of years they will only have one screen size again.
EDIT: Here is Tim's exact quote: "One thing is that we're not fragmented. Look at the percentage of users who upgraded to iOS 5. We have one App Store. We have one phone with one screen size, one resolution. So it's pretty simple if you're a developer."
I may be proven wrong, but I don't think this is anything but fake.