From SciFi Wire:
"After [speculating] that he might appear in a proposed fourth Mad Max movie, Mel Gibson is now saying he won't be in it just as news breaks of other casting for the sequel. Gibson talked with the Los Angeles Times about it:
'On the plans for a fourth Mad Max film: 'I'm glad [franchise director George] Miller is making it, and it's going to be the best one. I'm not going to be in it, that'd be corny.'
Meanwhile, The Hollywood Reporter says that Nicholas Hoult (About a Boy), Zoe Kravitz, Teresa Palmer and Adelaide Clemens also are in various states of negotiation to join the sequel, called Fury Road, which will star Charlize Theron and Tom Hardy (Star Trek Nemesis):
'The movie is set a short while after the story detailed in 1985's Mad Max Beyond Thunderdome, which keeps Mad Max, the character originated by Mel Gibson, relatively young. Details are being kept quiet, but it is known that Hoult's character is named Nux. Kravitz, whose character's name is Five Wives, Palmer and Clemens are in a convoy being chased by bad guys. The movie is slated to shoot in Australia this summer.'"
There, are you happy?