Thin? Flexible? Sounds perfect for an Apple Watch band.
As for sleep tracking, does the new Apple Watch actually last long enough to do that and charge up fast enough in the morning while showering? I'm still on Series 0 and it usually dies between 7-10pm depending on how much longer than 30 minutes I exercised that day—and that's after I've optimized all the settings for battery efficiency. I'm hoping the rumors about a slightly bigger display are true because it means we could get a bigger battery. mLED would also be cool because that could help cut down on battery drain even more. Isn't mLED a lot brighter than OLED, so you could theoretically run it in a lower power state to have equivalent brightness?