Here are some of my notes about small screen applications (glass/smartwatch) that I brainstormed a year and a half ago... Apple/Google/Samsung - please make this product.
Applications:
Time, Weather, Music, Games, Fitness, Universal Remote for Internet of things (car, thermostat, door locks, tv, game controller, camera, etc), Text Messaging, Payments/Digital Wallet, Flashlight, Voice Messaging/Notes, Voice Search, To Do List, Video Player, Hands Free Call, Facetime/Hangouts, Calculator, Calendar/Schedule, Translate, Alerts/Notifications integration, Dashboard/Tracker, Two factor Authentication, Data storage/exchange
Must Have features:
Microphone, BlueTooth, Accelerometer, Compass, Vibrate, iPhone compatibility, Android compatibility, iPhone notifications, Android notifications
Important features:
Camera, NFC, GPS, Touch Screen, Bright LED, I/R Led, Heart Rate,Water Resistance
Nice to have features:
Integrated Phone, Ambient temperature, Body Temperature, Blood Pressure, Video diplay driver/irda, Swappable Band, Swappable Case, Wireless Charging
Key functionality:
Shake gestures, Voice Recognition, Touch screen gestures, Swipe keyboard, Activity context, Use a desktop web app or tablet app to set up, Themes, Reflective display and Backlit Display
The Must Have Features are things that the device would need to support most of the applications' functionality.
The Important Features and Nice To Have features are things that I think would make the device a home run with broad acceptance
Key Functionality are things that many apps on the small screen device would share that would be an important part of the user experience.