Red Orchestra 2: Heroes of Stalingrad for now, because the mature rating has not yet been ratified for use in the country's ratings board.
Alan Wilson, vice president of Tripwire, posted an explanation in the game’s forums, saying, "We’ve put “LV” up for Australia because we haven’t got the rating back yet – and dear old Oz has just announced the new higher rating category. We are HOPING that they will take the same view as PEGI/BBFC and NOT go all silly on us. However, until we’re sure, we putting LV up to be safe. The Okkers may want to wait a few days and see what the end result is – but we’d hate for you to buy it and THEN find your ratings board can’t cope with dismemberment (like USK…)."
Red Orchestra 2 will be released worldwide on August 30. Hopefully, by then Australia will have the R18+ rating available.