The Fal'cie can control the weather. In conjunction with this, in certain areas, there are machines that control the weather as well. During certain weather, certain monsters will appear. So, as far as I know, controlling the weather will affect the appearance of certain monsters. This was explored a bit in the prequel novels.
This feature is in the game already, but its just in one area I think. So maybe they're spreading it to other areas as well.
Also, it indeed turns out that the DLC content rumor is true:
Dutch OPM Final Fantasy XIII Feature and Interview Scans - Final Fantasy XIII: News, Trailers & Screens ~ Final Fantasy-XIII.net
Also, for those complaining about the (superior) Leona Lewis song, they said they wanted to localize the original Japanese song, but the Japanese singer had difficulty pulling it off. So they're experimenting this around. I, for one, am glad they did.
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