I believe they will be in either the next movie or ROTK. They ride with the Grey Company to aide Aragorn and everyone at Helm's Deep I think, (correct me if I'm wrong), but from what I've seen from the TT clips and previews, I think they will be in the next one, cuz Arwen is suppossed to go with them. But I'm not 100% sure about that.
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*~Arwen~*
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