The image you'll find in here is taken from the CG in the brand new Halo 3 TV ad, airing on ESPN's Monday Night Football next week. Be sure to check it out and set up that Tivo. This is one you won't want to miss. Also, there is some football game playing that night. Apparently.
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The voice is clearly not from either of the children shown in the Starry Night scene. If you listen to their voices, neither of the kids sound as girl like as the girl that says "Time to go." When the Chief is saying "Not yet" it is most likely to the marines, because the loss of the Chief would make many marines think "Oh -blam!-, they got the Chief, were screwed!"