Hi JohnCody,
This is a really nice dream, but sadly, impossible to have 100% compatibility.
Android and IOS has many differences, and B4A/B4i, are not as high-level languajes to alow this portability.
I´m Sure Erel its going to do his best effor for giving us the most compatibility possible in the core comands, but for example, in B4A you have to deal with the lifecicle of the app, in IOS its completly diffeerent, so, you cant have the exact same code.
In the other hand, all my apps in B4A use external libs. Unles the author of the lib makes a version for IOS with the exact same methods and properties, it will break the existing code.