I don't think
Red Rackham's Treasure will be part of the second movie since it's been all but confirmed it will be part of the first one. Here's a break-down of the films:
The Adventures of Tintin: The Secret of the Unicorn is based on
The Crab with the Golden Claws,
The Secret of the Unicorn, and
Red Rackham's Treasure.
Peter Jackson says the second film will likely be based on
The Seven Crystal Balls and
Prisoners of the Sun - two of his favourite albums.
And Jackson says
Destination Moon and
Explorers on the Moon would make a good third or fourth film (if they get that far).
Tintinrulz:
90mins long? I seriously doubt it. If they're going to do the double-album adventure and incorporate elements of The Crab with the Golden Claws, it will have to be 2 hours long, if not more.
Hopefully it's longer then 90 minutes, yeah.