TLDR: I hope that disabling fitness tracking will help prolong the battery life of the Apple Watch so that us commuters can control our music while driving without worrying too much about draining our battery life. I wonder if we'll be given to chance to do this. The problem that I originally had with getting the Apple Watch is that the battery life wouldn't be suited for sleep tracking. I already have a Fitbit Charge (no heart rate monitor but I don't care for that), if given the chance to disable fitness tracking on the Apple Watch, I wonder if it would give a dramatic boost to the Apple Watch's battery life. I already have an app that syncs Fitbit tracking data into the Health App so I really don't need fitness tracking from the Apple Watch. Plus I really don't work out (yes I'm fat and overweight), so that heart rate monitor isn't a big deal for me. I have a Pebble Steel and the battery life is great. The main battery killer for me is controlling music while in my car. I assume that this will be the main task that drains the Apple Watch's battery life for me so I feel that if I could disable the fitness tracking that I'd be able to get the Watch to last me all day and I wouldn't mind charging it at night (since I'd still have my Fitbit Charge). I'm currently backing the Pebble Time so I can cancel that Monday night after checking out the Keynote (I'll be at work so I probably won't get to know much until later in the day). I doubt that they'll announce whether or not we can disable fitness tracking on Monday but I'm sure that I'm not the only one that already has a decent fitness tracker that would rather disable fitness tracking on the Apple Watch.