If Apple does unveil an iPhone 5C, I expect them to concurrently abandon the iPhones 4 and 4S. Their three pricing tiers for the next year would be a new iPhone 5S at the high end, today’s iPhone 5 in the mid-range, and the new 5C at the low end. This way, all new iPhones would sport 16:9 aspect ratio displays, and all would have Lightning adapter ports. Adios both to 3:2 displays and the grody old 30-pin port.
Pretty much exactly what I’ve been thinking.