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You can use the W,A,S and D keys to move the camera around, Q and E to move it up and down. Hit J to toggle mouse look; this allows you to use the mouse to change the direction the camera is facing.
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Toggle the text box with L. Use the arrow keys to see suggested questions, or type in your own questions. Hit Say to ask Brad the question.
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You can talk to Brad using a mouse and microphone when Unity is in full screen mode. Use the M key to turn this ability on and off. When the ability is on, click and hold the left mouse button while you are asking your question, and release when you're done talking.
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Use the ~ key to bring up the console.
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