Their systems are poised to make some big advances in both input and output. They are the only company I know of that's looking at the whole loop. When people say they are using natural language, it's often terribly misleading. One man's ceiling is another man's floor. It's the same thing with dialogue.
Some people say it's possible now to have a dialogue with a voice-recognition system.
But the machine takes all the initiative. What we're trying to develop at MIT are mixed-initiative systems. That's more within reach, where you ask a question some of the time, and the machine asks a question some of the time. The goal of natural language is information access and problem solving. Not in my lifetime.