Based on history and what I've learned and witnessed from Apple; and from those here that have commented re: design, saying, "Why would Apple change the design of the, 4,4S,5,5S since it's doing so well and the market welcomes it." I would then think that next year's iPhone 6 will be very similar in design as the iP4 and iP5, but with a "slightly" larger screen, as Apple did incrementally with the 5's 4" display from the 4's 3.5" display. I suspect it will increase only to 4.3" or 4.7", but no larger based on Apple's conservative approach.
My attitude on next years iP6 is not have too high of an expectation on a significant redesign, especially with the introduction of this years 5C.
My attitude on next years iP6 is not have too high of an expectation on a significant redesign, especially with the introduction of this years 5C.