The only reason SR4 was refused was because it contained sexual violence and drugs being a reward for tasks

See below

"In the Board's opinion, Saints Row IV, includes interactive, visual depictions of implied sexual violence which are not justified by context," reads the ACB's statement. "In addition, the game includes elements of illicit or proscribed drug use related to incentives or rewards. Such depictions are prohibited by the computer games guidelines."

MK doesn't do either of those so it will be ok in Aus

I hope MKX will get refused in Australia. And I hope it causes such a riot that the government will have to change the whole system for these classifications! This would mean a more permanent change instead of MK fans sitting at home, crossing their fingers and hopes for the game to slip through, which it most likely won't.

Don't just hope for the best, Australia! Fight for getting the system to change!

^ what he said.