The roles are the same, though the names have been Americanized. Smit-McPhee will be playing Owen, the lonely boy who befriends the strange smelling girl who haunts his apartment complex. Moretz will be playing Abby, the immortal with a child's face. Jenkins will play her caretaker, Hakan. (They haven't decided what to change the name to, I guess. I bet you'll see him renamed Hank or Henry before long.) While I haven't seen enough of Moretz to judge her work, I know Smit-McPhee and Jenkins will be fantastic. (If you haven't rented Romulus, My Father, do so! Its a wonderful film, and it'll give you a preview of what you can expect out of Smit-McPhee in The Road.)
Of course, the performances will all depend on how the troubling, eerie story is handled by director Matt Reeves. If the nuances of the characters are bungled, then it won't matter how good the cast is. Let Me In begins filming in New Mexico (now there's a departure from the Swedish snow) this fall, and will hit theaters January 15, 2010.