It seems like AA and AS are working closely with each other based on AA's changes that were announced today as well. The fact that they're working together is somewhat worrying with the AS program from the bonus earning rates on partner flights, redemption rates, and routing rules (specifically stopovers). I doubt AA will be happy if AS kept most of those things as-is as it would entice many AA elites over to AS, depending on how the complimentary upgrade reciprocity goes.