Next-generation iPhones likely to focus on internal improvements.
Bloomberg Confirms September iPhone 5 Launch, Hi-Res iPad 3?
They cite two people "familiar with the plans" who indicate that the new iPhone will carry a faster processor and more advanced camera:
The device will include the A5 processor, the more powerful chip that Apple added to the iPad 2 earlier this year, along with an 8-megapixel camera, up from the 5-megapixel model in the iPhone 4, said the people, who asked not to be identified because the details aren’t public.The new iPhone is said to closely resemble the iPhone 4. As expected, the new iPhone will run iOS 5 which is reportedly codenamed "Telluride".
Bloomberg's sources also report that Apple is testing a version of the iPad that has a "higher resolution screen, similar to the one now used in the iPhone 4". From here, Bloomberg references older rumors that Apple might be working on a cheaper iPhone aimed at attracting customers in developing countries. They seem to believe that work is continuing on this low-end iPhone.
Finally, they report that the resolution of the new iPad would be "about one-third higher" than the iPad 2. Such a small increase would be a surprise as Apple's method for increasing resolution on the iPhone was to double each dimension to offer simple scaling for apps. It's been expected that Apple might adopt the same technique in the iPad 3, though technical hurdles may exist for such high resolution displays.