The first device will have just under a 5-inch screen, likely 4.7 inches to keep the same size ratio the 4-inch iPhone 5S has. The second phone will have a very large screen, probably around 5.5 inches.
If the reports are true, it would be a welcome change. Most phones sold today have screen sizes larger than four inches, and a bigger screen is one of the most-requested features for iPhone users.
Designer Federico Ciccarese put together a few mockups of what the next iPhones could look like based on the information we have so far.