From https://developer.apple.com/watchkit/
"Apple Watch represents a new chapter in the relationship people have with technology. Starting early 2015, you will be able to deliver innovative new experiences to your customers on their wrist. Learn how your existing app notifications can easily show up on Apple Watch. And by leveraging WatchKit, you can take your apps even further by extending and enhancing their functionality on Apple Watch."
It sure would be nice if existing app notifications with Corona worked! But it looks like Enterprise (or a non-Corona approach) will be necessary to support “WatchKit apps, Glances, and actionable notifications.”