It could be the next generation of controllers (yes, I am kidding)
When is an electronic piano more than just a piano? When it's the Blue Man Group Keyboard Experience. This 37-key synthesizer keyboard offers a variety of instrument voices, including organ, guitar, trumpet, violin, strings, drums, slap bass, and others. Motion-sensitve tubes line the top and side of the keyboard. These tubes are used by waving your hands in front of them and can function as different drum voices, to "remix" one of the ten pre-programmed songs, or to adjust tempo and volume.
You know 10 years down the road someone will retro use one of these as a nostalgic joke.