nerding again: Sabartooth's mutation is progressive. He started out looking mostly human but as he ages he becomes more animal like in appearance and behavior. i hope the screen shots/promotion/teaser clips are from early in his transformation. he's in uniform so it might be from the Weapon X era.
Wolverine and Sabartooth have similar mutant abilities (the original creator intended Sabartooth to be Wolverine's father) healing factor, super strength, heightened animal instincts, etc) both were altered/enhanced by genetic tinkering. some of Sabartooth's and Wolverine's mutations were halted by the adamantium bone coating. both characters reverted to a feral state when the adamantium was stripped from their bodies.
the net scuttle is the film hints at Sabartooth being Wolverine's half brother. *squee*
if this movie lets me down i'm making deals with devils for revenge. just letting the universe know in advance. nerd rage is a powerful rage.
ML