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AirPlay is supported on "Mountain Lion". Those with a next-generation MacBook Pro, the display can be optimised for the new Retina display.
Dictation settings allows you to teach it how you speak. It also comes with a warning that any data will be uplaoded to Apple. No dictating the nuclear codes, Mr. President.
Users can also change the voice style and language of the voices used in Speech. Apple even provides three sexy British accents to play with.