Richard:
I'm sure the discovery will be in this film. Don't forget Red Rackham's Treasure (the book) is essentially a wild goose chase
I'd been assuming that too, especially since there have been interviews with Speilberg and Jackson suggesting that they were considering books other than
Red Rackham's Treasure for the second movie. However, this latest interview, linked to recently by BlackIsland in the
New Movie News and General Discussion thread seems to suggest that they've been
keeping back Red Rackham's Treasure till the next movie.
This interview also seems to confirm that the sinsister baddie in the trailer is a baddied-up Sakharine (bang goes my theory that he was a thinned-down Ben Salaad!), and the interesting news that that Daniel Craig is playing Sakharine, rather than Red Rackham, as widely reported previously. Here's the relevant paragraph, from the end of the interview:
So Spielberg, Jackson and the various screenwriters combined bits and pieces of the two books--among other things increasing the villainy of the film's nemesis Ivan Ivanovitch Sakharine (the character Daniel Craig plays, as opposed to the previously reported pirate Red Rackham)--together with some elements from 'Unicorn's' sequel Red Rackham's Treasure to create the film's eventual story though much of Red Rackham was set aside for Tintin 2.
"The second film would go into [Red Rackham's Treasure]," Jackson said, which he himself planned to direct. "That's the idea."
That's not to say that this means they won't have Tintin and Haddock finding the treasure at the end of this film, and Haddock regaining his ancestoral seat at Marlinspike. Clearly they're mixing up elements from different books to create a new story. But it does suggest that elements for Red Rackham's Treasure - presumably Calculus and his shark sub - will be incorporated into the next film.
This should probably be in the plot speculation thread. But with all these different Tintin movie threads it's not easy keep track of all the latest news about it or to know where to post things!