The Apple Watch has been on sale since the spring, and like all Apple products, it has been the subject of intense speculation, criticism, fawning and doomsaying. Expect all of it to accelerate, because on Monday Apple is releasing the first major upgrade of the watch’s operating system. The new software had been scheduled for release last week, but Apple postponed the rollout at the last minute because of an unspecified bug. That bug has now been fixed.