Features of a potential iWatch?

With the Galaxy Gear being announced soon I thought it would be interested to see what sort of features people would expect/want from an Apple smart watch.

Personally I'd like to see the following,

  • Notifications - everything that I see on my iPhones lock screen.
  • Remote Camera Trigger - the ability to trigger my iPhones camera remotely along with a preview of the scene.
  • Caller ID with ability to dismiss calls.
  • Clock - this would be the default screen when not in use.
  • Navigation Aid - providing both direction (based on compass) and next turn when iPhone is in navigation mode.
  • Music controls when iPhone is playing music.
  • Siri.
  • Compass.
  • Passbook and tap to pay.
  • Proximity unlock on my iMac
  • Various fitness tracking features.
  • Sleep cycle monitoring with adaptive alarm.
The vast majority of these are contextual which makes me wonder how third party apps would work. Hopefully some kind of API that allows smart phone and watch apps to link together in some way.
What features are you hoping for?