A Taiwanese website Apple.pro is reporting that Apple is testing three different iPhone prototypes. One prototype reportedly includes a side-sliding keyboard while the other includes a 4 inch screen. Another model is rumored to have an upgraded battery and an 8-megapixel camera instead of the 5-megapixel that comes with the iPhone 4.
Apple had earlier hinted at the idea of a QWERTY based iPhone 5 but the idea was scrapped due to unknown reasons. There are wide spread rumors that Apple was also working on an iPhone Nano which would be cheaper and smaller than the iPhone itself.
Stay Tuned for more updates.