WEMO has the output devices fairly well covered. (light switch, dimmer switch, wall socket devices)
What I would like to see are input devices that can be used to trigger the existing output devices.......
Bring back a motion detector. (indoor and outdoor)
A temperature sensor that could be used to control output devices through rules.
A hand held single function or multifunction remote (use WEMO without a phone while on home wifi network)
A panic button that could be used to turn on several lights with one button push.
A humidity sensor.
And most of all...... produce the WEMO Maker again.