This page has info on the V35A-FTS engine. It also shows the differences between the Lexus LS500 and Land Cruiser (Tundra?) versions.
I don't think aussies will be getting gasoline 300-series LC. But they will probably get it as the 300-series Lexus. The 200-series aussie LC was V8 diesel only but the aussie LX could be had with the 5.7 V8 (LX570) or diesel V8 (LX450d).I really can't wait until some crazy Aussies and Emiratis put in methanol injection, bigger injectors, bigger cooling, and bigger turbos in it.