During the Q&A session of Jeff Bezos' interview by Charlie Rose, the last question was

What's the next really big thing that's not incremental in the world of - a planet where everybody is connected to everybody?

Jeff Bezos: I think if you take the next big step, I believe for mobile, the thing thats going to be the biggest part of that is voice ... you should be able to talk to Amazon.com ... in the short-term it will be kind of a stilted special-purpose language ... but in the long-term it could even be natural language processing.