It's just a theory of my own. Don't shoot me if it doesn't come true. I think I already posted something similar a while ago, but I think I have even better reasons to justify my case now. So my theory is that Apple might announce (but not release) the larger iPhones at WWDC. They would go on sale in September. The original iPad was announced several months before it was released. While it was mainly to avoid FCC fillings to spill the beans, it did give the opportunity to developers to prepare iPad optimized apps so that on release day there was already a thousand iPad apps. Releasing an iPad that could only run blown up iPhone apps while waiting a couple of weeks for optimized apps to appear wouldn't have faired well (especially since a lot of people were saying that the iPad was "just a big iPhone"). Unless Apple simply blows up the 1136x640 resolution to 4.7" (and I don't think they will), new UI layouts will have to be created for apps to take advantage of the extended screen area. 2x and 3x resolutions would NOT solve that problem. It will be easier for full screen OpenGL games and apps that already use the auto-layout APIs (a lot still don't) but it would still take a minimum of modification and testing. The iPhone 5 was released without warning, but running 3.5" apps on it wasn't that bad, only small black bars on the top and bottom. Without optimization for a 4.7-5.7" screen, apps would either look like blown up 4" apps, or have big black bars all around them, much like iPhone apps on the iPad, which I don't think Apple considers to be acceptable to have only non-optimized apps in that form on launch day. So it would be in their best interest to warn developers in advance like the original iPad so that when these iPhones go on sale there would be a lot of optimized apps ready. Wouldn't that negatively affect the sales of the iPhone 5s between the announcement and release you ask? Probably. But for the last few years and especially in 2013, iPhone rumors have become mainstream, and iPhone sales tend to drop significantly anyway as the expected release date approaches, just from rumors of a new model. The Samsung/Apple court case already seems to spill a lot of beans in the mainstream media about the possibility of a larger screen iPhone. Announcing larger iPhones could also be a double-edged sword. Some of the people wanting a larger iPhone screen would wait until the release, but people that want the 4" might decide to buy a 5S this summer as they'd think it would be the last one of this size (Apple could unveil a 4" version of the iPhone 6 in addition to previously announced larger models in September and piss them off ). The official announcement of a larger iPhone could also negatively affect Android sales as a lot of the people thinking about switching to Android because of the bigger screen would reconsider and wait for the large iPhone instead. So all in all I don't think the 5S sales would be much worse than they were for the iPhone 5 last summer as the 5S rumors went through the roof. And the advantage would be tons of optimized apps on day one when these go on sale.