WWE will be running a show in October at the 100,000 seat Melbourne Cricket Ground in Melbourne, Australia, according to the Melbourne Herald-Sun (link has a pay wall, so might not work).
The report says that the show will be a PPV in “early October,” but that might not be accurate, since WWE currently has TLC scheduled for October 21 in Boston, though tickets are not on sale yet, so I guess it could be changed.
The report says that an official announcement about the show would be made at WrestleMania.