David,
It will be a while before we can do any of that. We won't have ARINC-429 at launch, which is what you need to interface with the 430. We will be working on it very soon however.
I doubt we will ever talk to the KX-125. We've had very bad luck interfacing with the King radios in our current products.
Also not sure that we will output data over ARINC to an autopilot. Are you talking about GPS steering or something else?