AR glasses, I'd bet. Interest in smartwatches has remained lukewarm despite years of aggressive improvement. But if a company could put a HoloLens in the frame

AR glasses, I'd bet. Interest in smartwatches has remained lukewarm despite years of aggressive improvement. But if a company could put a HoloLens in the frame of a stylish pair of glasses - using AR tech which Apple and Google have both been aggressively innovating on in their respective phone frameworks - I think that could be a very real improvement over these awkward rectangles we have to fumble with and drop and which constantly pull our eyes away from the world around us. The hardware challenges are significant, but the same was true of the original iPhone. And we know Microsoft and MagicLeap are both making lots of progress - I wouldn't be surprised if Apple and Google are doing their own hardware research.