I'm too lazy to link but apparently Jackman said, while publicising Prisoners, something along the lines that it would take a really special script to get him to reprise the role again. Personally, I'm taking that with a pinch of salt.
It'd be cool if in 20/30 years they brought him back to do an Old Man Logan
style Wolverine movie. Although to be fair by then I'm sure they'll have probably rebooted the character/actor twice over.