The same questions are being asked over and over again and it's driving me crazy! 1. Pre-authorizations usually fall off on pre-orders then you get fully charged when the item ships. 2. No the apple watch will not be upgradable, they will release new versions. 3. If your delivery date is 4/24-5/8 check your order on 4/22 and I'm sure you'll be pleasantly surprised. 4. Rule of thumb: 38mm women and children or people that like small watches, 42mm men . The watch is 10.5 mm thick and fits under shirt cuff.