It seems like conspiracy theory but Apple's and other competing manufacturers' aren't really on the same page in a lot of things. Apple has approached connectors and connectivity in general in a very closed fashion.
What seems odd though is that the new USB Type-C connection in many of the new Android flagships would seem to be a way more sensible choice. Why would Samsung replace a headphone jack with another one instead of following Apple suit.
Also Apple would probably not be hurt too much from a incompatible connector since it's trying to move more and more to wireless.