The technology came out of a government funded project on which hundreds of people worked.
It's iterations ahead of the market and so it's real AI with real use.
It will be useful to most people most of the time.
It can't understand languages other than English.
It can't answer relationship questions.
It may have an open API, in the future.
It may allow you to pay for things, in the future.
It may use social data, in the future.
I guess I'll just wait for the actual release to see why and how this is world-changing. If the product is truly world-changing, I don't think anyone can do justice to it with a blog post. Imagine if people tried to explain Google the search engine like this.