I'm starting to think that Wolverine doesn't take the offer from that dieing man, because if he did I wouldn't think he would be surprised when he stopped healing. In the interview with Hugh Jackman and James Mangold, they mention Wolverine's "kryptonite" which I hope is either carbonadium or Viper's poison. It might be something else that stops his healing factor, but it is just a thought. Also, I find it weird that he is still able to survive gun shot wounds like in the trailer. I have the old comic that The Wolverine is based on and he doesn't heal as fast as he does now, but over the years they have increased his powers. On a side note, I have read Ultimate Hulk vs Wolverine and in that Nick Fury described Wolverine's power as the ability to survive as opposed to just heal.