
Viper, who is played in the film by Svetlana Khodchenkova, is a former peer of Wolverine who has been an enemy as well. She has immunity to toxins, and according to Mangold “views Logan like a great hunter might view hunting a lion in his quarry.”
Fox has previously released a Japanese art-style poster of Wolverine that has been a huge hit with fans as is evidenced by the fact that over 50% of the bus shelter posters with the spare, iconographic image have been stolen (see "Poster Theft Index Says 'The Wolverine's' a Hit").