The video's description provides a further hint, suggesting some kind of high quality visual and audio capture, in keeping with Nokia's hallmark camera innovation.
See and hear what you've been missing. Coming soon.
The device, which is understood to be exclusive to the US operator, is a follow on device to the Lumia 928 and, based on the currently available information, is essentially a smaller screen version of the Lumia 1520. The Lumia Icon is also expected to have the same Rich Recording and directional microphones capabilities as the Lumia 1520, something that would fit with the audio heard in the teaser video.
Nokia usually posts this kind of teaser just a few days ahead of a formal product announcement. That would suggest an announcement some time next week, but there are no guarantees, especially with MWC being just over two weeks away (though an operator specific handset might creep under the fence).