I think the magnetic attachment rumor is absurd. There’s no way that would be secure enough. Even if it was, I’d think the strength of the magnets would be so strong that it would dominate the compass of the watch.
I read a good article once about how Apple backed themselves into a corner by not using regular band attachments with pins. At some point, I think people like us, who have lots of and/or expensive bands, will have to swallow a bitter pill. It’s never going to be like buying a nice mechanical watch. It will eventually be disposable.