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Given the high level of integration of modern electronics, the mechanical challenge of fitting so many features into such a small packages will be the biggest problem.
This integrates an SA-1 high performance RISC core with MMUs, cache memories, LCD controller, several serial ports, a memory controller, a real time clock and more into a single chip.
This has ADCs and DACs for the telephone port, the microphone and speaker, the touch pad, battery level monitors and so on.
Two 64 Mbits chips are soldered directly on the main board, so expansion is not possible (except through the PC Card port, but that is hardly a high performance option).
The system software is stored here. It can be upgraded in the field, if needed.
This part is still being designed. CCD chips from Sharp are being considered.
While AAA bateries are ideal from a size and weight point of view, they are underpowered for this application. If possible, AA batteries will be tried instead.