Arwen has 12 lines in LOTR, she isn't a chracter, just coz hollywood had to have a leading lady doesn't mean they should piss all over a book to make the part fit. So back stories are just filler, there isn't a back story for arwen, her dad perhaps as he is rock hard. Given that they change the book for minor things like erkenbrand going instead of ermor to lead the army at helms deep, they can change what they want to suit their needs anyway, so anything they do film will be made up. And as it is films rights not book rights, christopher tolkien isn't involved, the only person knowledgable enough to know what should be in the film.
Silmarrilion the TV series, eh? The first age, Tulcas the god of war dancing and prancing as he taught the elves to fight, or as he chained Malcor (the god who taught Suron and created orks from corrupting the elves) for being a naughty boy. How the hell you would get dumb ass americans to care about the playing of the music, how a bad note can start a doscird which is evil. Or how the dwarves were created by a god who wanted to play a different tune. Or perhaps ungulliant, who gave birth to shelob and her sisters then threatened to consume the world till she was stopped by malcor (who created her). Only the death of Galadriels dad would be anythiing worthy of them watching. They would have to explain who actually started the rumour that no man could kill the witch king, which would then ask the querstion, why the hell was liv tyler in the films instead of glorfindel.
It would be changed horribly to suit an audience that doen'st understand.
Gandalf arrived in middle earth in around 1000, that being two thousand years before the films (and just before the balrog took over moria), he is an angel (to use words that don't require a sad tolkienite), sent from heaven to fight the evil that is sauron, so aging is completely irrelevant in any setting. He forgets because he is that old.
Gap filler movies.
Problem is Hollywood has no decent writers that could do this justice, they rip off history at their leisure and they rewrite the classics to suit their marketing needs, I wait for the hobbit to have a leading lady... 15 dwarves, 1 hobbit and Ian mckellen fight a dragon... Where is the leading lady...
A two part hobbit could be good, a filler movie won't be.
Hollywood we wait and see...
Mines the one with the quenyarin stylised collar....