Apple should develop a RTOS kernel for iDevices.
With the advent of the iWatch, Apple should integrate a realtime OS in to its source tree for Darwin. The constant checking of user interaction among threads would scale well for multicore devices in the future. The ideal setup would be to run the scheduler in its own core while have the applications run in 2 or more cores to free resources. If I totally missed the mark then let me know.
The benefits I see could allow for arial drones to have instant activation and manipulation; reading peoples pulses in video games; sky diving, I know google glass has that as a benefit of google glass however even a second timing delay in that environment is not acceptable. Photography and most importantly for a futuristic Apple... Robotics. 1/60th interaction is extremely important when it comes to human interaction.
I would appreciate everyones 2 cents.