The latest analyst notes and circulating rumours claim Apple will release an iPhone 5S and budget iPhone this autumn, but what about the iPhone 6?A designer has recently mocked up the iPhone 6 and has some interesting ideas in mind that seem both beautiful and impractical for a device that should debut in 2014. Still, it's always interesting to peruse the possibilities and all the "what ifs" when it comes to upcoming iOS devices.Read: Analyst says iPhone 5S supply will be constrained, budget iPhone to arrive in SeptemberPritesh Chavan's concepts depict a flat iPhone 6, mimicking the flat aesthetic of iOS 7. But that's not all: the iPhone 6 is foldable. It features 3-in-1 screen sizes, which expand the display from 4.2 inches to 5.8 inches and then to 7.5 inches.Chavan called his creation the iPhone and iPad in one. Of course, the iPhone 6 concepts are all highly unlikely. Apple would never canabilise two product lines with one device. At least not within the next two years.But for those interested in daydreaming, check out the rest of his work to see what else the iPhone 6 - or rather iPhone 16 - could offer.