Despite Steve Jobs’ apparent dislike towards physical buttons, AppleInsider today highlights a report by Taiwanese website tw.apple.pro in which the site claims that Apple has already built and is actively evaluating three separate prototypes of the iPhone, one prototype is said to carry a “sliding cover” to conceal the device’s keyboard.

Another prototype reportedly built by Apple looks largely like the iPhone 4, but has improved hardware including longer battery life and superior camera. That version of the handset would not be a major physical change from the previous-generation iPhone 4, and would be akin to the iPhone 3GS replacing the iPhone 3G, the report said.

Finally, the site also reiterated rumors that the next-generation iPad will include a built-in camera, and will also be thinner than the first-generation model.