I found a great paragraph in a Google page about Gmail actions:
"Google Search is evolving from surfacing search results to answering questions. With Voice Search and Natural language queries, users can speak or type questions they have and see highly structured information cards in Search."
That changes how people interact with Google Search, how Google Search pages look, how queries are processed and what people expect from Google. When Google will be able to answer complex questions, to summarize long pages, use inferences to find new information and truly understand human language, you'll no longer need a browser for most searches. A Google search button can be embedded in any smart device from watches, fridges to smart glasses and cars.
In a recent video, Matt Cutts tries to predict the future of Google search: "It ought to be able to go out and take multiple sources of information and figure out how to combine those together and fuse or synthesize that information. And it should really be able to handle difficult syntax. So moving up the chain towards not just data or knowledge, but analysis, towards wisdom."