Six Columbia University students have bridged the gap between Android and iOS with something called Cider (via The Next Web). The Android version of Cider essentially fools iOS applications into believing they’re running on an actual iPhone or iPad. Tsk, tsk!
The video linked demonstrates the software in action on a Nexus 7. iOS applications run side-by-side with Android software as if they were real, native Android apps! Performance is admittedly crappy at this point, nor can apps access most hardware. But take this alpha for what it is – something that shows much function if/when it reaches maturity.