Today I sent a note to Daring Fireball saying ythe following. I think the backing for the Apple Watch will be easily removable and will support swaps at the Genius bar. What I mean is that the casing, which will be the expensive part,will be static and the engine, currently the S1,will be replaceable at the Apple store. Apple currently has the mechanism to replace screens for iPhones at the stores. It seems to be a small stretch to support removing the backing on the Watch and replacing the smarts inside quickly. I'm even thinking that the recent changes to triaging Genius requests has something to do with this. Of course, we'll see what happens over the next year.