Yes you can plug a USB microphone into the console if you like, but remember that wire-based headset you got in the box? It might not have had the best fidelity through its one earbud, but the unit on the main cable doubles as a speaker, meaning all the voice commands usually associated with the additional PlayStation Camera can be used right away. Everything from leaping between apps to powering the console off can be done just by first addressing the unit as "PlayStation", before all of the above commands come into play.
