What surprised me the most was the great amount of darkness in the trailer, and entirely serious subject matter.
But don't worry, I, the big fan, loved it. Williams' score is wonderful, the characters' faces look decent enough (but where's Haddock) and there's certainly more action than I expected. As for Tintin's face? Well, it's still rather awkward, as it's normal-looking compared to the cartoony look of the others. I don't want to leap to 'dead eyes', but it's kinda odd. Never the less, I can live with it, and I still look forward greatly to this.
Also, I dig Bell's voice as Tintin.