Saints Row 4 was originally expected to hit the stores later this week, and many retailers, which includes EB Games, Gametraders, etc. have adjusted the release dates to September.
Steam has not yet specified the date in September meanwhile EB Games are planning to release by September 20.
Deep Silver was not available to comment on the situation right now. It is said that, in Australia, only a censored edition will be released as inclusion of drugs are prohibited in the country. The delay in game release will have effect on the physical and digital version of the game.
GTA V will be released around the releasing date of Saints Row 4.