Does the new iPhone 5 Lightning connector still provide serial output (or does it when the dock connector adapter?)?
I dont't know if this is what your're looking for but anyways.
Momentarily it is a work in progress. I hope we'll get some info soon.

https://www.youtube.com/watch?v=4f8aUUHrHKc

P.S. I am not affiliated with this, I was just looking for it.