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From my Beano
It is extremely unlikely that iOS will ever be "ported" to the Droid 3. The iOS source code is kept under tight security so the iDevice ROM would need to be reverse engineered and the hardware specific parts would need to be rewritten for the D3. If this were accomplished then Apple would do a C&D. Either way - ported or made from scratch - the apps would need to be reverse engineered/patched/emulated to run.
You can just install Go Launcher and get one of the many iOS themes if you want the appearance of it at least.