I’m sure if Apple decides it’s worthy to ship it‘s going to be an improvement, but I can’t imagine how any sort of magnetic attachment could be strong enough to hold a watch to your arm.
I had the Milanese loop, which has a magnetic closing mechanism, and while biking on cobblestone it basically fell right off. How on earth should that be strong enough for mountain biking, diving, surfing, and all the other things Apple loves to show in their ads?
I highly doubt we’ll see that, but I’m happy to see radical changes to the watch itself.