User blog comment:LoveWaffle/Sweet Merciful Crap, This Is What Viper Looks Like in The Wolverine/@comment-4966384-20121013040756/@comment-1895174-20121013044434

All sources, including press releases, say Viper. It's possible that the character will be changed at some point, though. Dominic Monaghan's character in X-Men Origins: Wolverine was supposed to be Beak until he was abruptly changed to Bolt at some point during filming.