The watch part. It does plenty of other things, but if I can't tell time, it's useless to me. Other than that, probably the HR monitor. I work out a lot and hope it works well.
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Notifications and tracking steps and stuff. My Pebble can do that but it can't do more thing at a time, so if I want to track steps, I have to open the App, but then I can't check the time.
Notifications and working out to music via Bluetooth headphones. Heart rate and other fitness trackers. Telling time and weather at a glance. And the possibilities of useful 3rd party apps, of course!