The wearable Snapcam, which has a footprint of 1.5×1.5″:
Users can attach the SnapCam to a piece of clothing using a clip on its rear, which can be rotated to keep the camera upright. The clip is also magnetic, allowing the camera to be attached to metallic objects. The SnapCam is powered on with a swipe motion across its front and is said to boot up within 0.1 seconds. Users can then tap the device once to take a photo, twice to start recording video or three times to start live-streaming video.
Seems like a boon to some street shooters, but not quite as obvious as Glass. Just as potentially irritating privacy-wise since you can not only record video but start a streaming broadcast.