They are taking some of it from appendix A in the back of The Return of the King. That's where the story of Arwen and Aragorn is. When RotK comes out viewers will know why they are getting married instead of sitting there wondering where that storyline came from.
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*~*Call me a relic, call me what you will.
Say I'm old fashioned , say I'm over the hill.
That old whine ain't got no soul.
I'll stick to Old Toby and a Hobbit hole.*~*
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