The information was delivered via a post on the official Facebook page of the game’s developer, Shin'en Multimedia. The positive news is the eShop title will be put through the classification process as quick as possible:
We have good news for all Australian Jett Rocket fans. The game is not yet rated there but we [will] try to get it through as fast as possible!
So there you have it. If you are an Aussie – and you’ll be used to hearing what we're about to say – you will just have to be patient and wait.