Update: on the developer forum an Apple employee provided a more accurate breakdown: 1. Watch App 2. Watch App with Glance 3. Watch App with Actionable Notif

Update: on the developer forum an Apple employee provided a more accurate breakdown: 1. Watch App 2. Watch App with Glance 3. Watch App with Actionable Notifications 4. Watch App with Glance and Actionable Notifications 5. "Fully Native Apps" In other words, you can't have glances or actionable notifications without a Watch app.