And another Mary-Sue-iel...
The Canadian actor Evangeline Lilly, who starred in Lost, will also be in the film, Jackson said. Since strong female roles are thin on Middle Earth in Tolkien's work, they've invented a role for her as Tauriel, a woodland elf. "Her name means 'daughter of Mirkwood' and, beyond that, we must leave you guessing!"
Though I approve of Cumberbatch as Smaug, and bizarrely I think Dame Edna will make a good Great Goblin, Sir Les Patterson is described as "Obese, lecherous and offensive, this farting, belching, nose-picking figure of Rabelaisian excess is an antipodean Falstaff." which bodes well!