@pettytyrant
"I've watched the trailer again and besides Gandalfs line to Bilbo near the start there is no Tolkien based dialogue"
It's a two and a half minute teaser one year from the release of the film. Let's not condemn Jackson & Co. on the strength of that, eh? Besides, the inclusion of the song should be more than enough to counter your concern, in fact; they're clearly prepared to include something as resolutely unfashionable as (Tolkien-scripted) folk-music in their multi-million dollar opus, so why the doubt?
"...resulting in the complete destruction of the characters you mention"
I think this is way, way, way too extreme a claim and totally unfair. Ok, so you didn't get Gimli's defence of Galadriel against Eomer but you can't have everything. You got his resentment of Legolas at the Council, his bewitchment in Lothlorien, the beautiful scene in the canoe where he sighs "She gave me three", his consideration of Legolas as a friend by the end RotK. The arc is there. And besides, the comedy was a hit with audiences. I remember very clearly the laughs in the cinema at the "You could have picked a better spot!" line and his "We dwarves are natural sprinters, you know; very dangerous over short distances" is the funniest line in the trilogy.
Anyway, back to the trailer, right?
@Joel
Yep, I too expect that the trolls will best the dwarves and they'll end up in their sacks (or something similar). I don't think we've much to worry about there.
@Ataralasse
"the books are a delight, and the movies are a delight of another sort"
Couldn't have put it better myself. Nice.