Other important scenes show elves re-making the ancient sword of the king of men, Narsil, which is given to Aragorn to lead the men with.
When he gets it, it's renamed Anduril, and helps him live up to his destiny as the returning king of the film's title.
For big fans of the story, one of the best bits is the first look at the She who Gollum talks about at the end of the second film - but in case you don't know who She is, we won't spoil it any more than that!
In fact that's probably the best bit about the trailer, as it leaves a lot of really cool stuff out.
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