Ask HN: iPhones are mundane. What's the new grail?

I'm writing a comedy about startups, and I need to invent a feasible portable technology that could appear in a couple of years. But the iPhone made such a qualitative change to what people could do while standing on a sidewalk, all I can think of is a hands-free voice-activated search device. And that seems more like a ten-years-out technology.

To be honest, I'm probably gonna go with the above idea, but now I'm wondering: is there any handheld/wearable device that's so close we can taste it?