Soule explained that, in order for Logan’s return to mean something, they made a change to his powers and now those razor-sharp adamantium claws of his can now heat up to extreme temperatures when they’re let loose.
“Wolverine’s body has been missing. The entire Marvel Universe has been looking for him, because he’s a very important part of the Super Hero puzzle. And at long last, he will be found,” Soule tells Marvel.com. “I thought this was a real opportunity to do things that would make him feel new and fresh in a way; if you come back from the dead, it should mean something. One of the outwardly physical manifestations of that is that now, from time to time, his claws—once they’re popped—they can heat up. They can get really hot.
“The way I think of it in my head and the way I’ve described it in scripts to Steve is you’ve got a blacksmith who is working with metal on his or her anvil and it can be red hot, yellow hot, white hot, all of that stuff and Logan can do that now. If Logan comes at you and his claws are heated up and blazing you’re in big trouble.”