According to this Reuters report, the highly regarded British screewriter Steven Moffat will pen three Tintin movies:
British scribe Steven Moffat, best known for writing the new "Doctor Who" series, is turning his hand to "Tintin," the DreamWorks movie trilogy collaboration from Peter Jackson and Steven Spielberg.
Jackson and Spielberg will direct one movie each. Obviously, they should be desperately trying to convince Guillermo Del Toro to direct the third. For those of you unfamiliar with Tintin, may I suggest starting with Tintin in Tibet.