Looks great for careful gestures performed in a controlled environment by someone with limbs/appendages that are roughly the same size as those from who the gestures were calibrated with.
Hence I believe they will likely have false-positive problems from say:
1. For gestures: someone with different sized hands
2. For couch + TV example: if your dog just jumped on - how do you differentiate between dog and child. Do you need to calibrate in each user?
3. Music device example: how much stuff that you touch during the day may have a capacitive profile similar to a known gesture?
Also, some of those "applications" in the video are so completely retarded (door knob, food bowl examples) that they distract from other potentially interesting applications.