Four of the key talking points ahead of the 2016 Formula 1 season opener at Albert Park in Melbourne.
Mercedes say they owe it to F1 to let Lewis Hamilton and Nico Rosberg off the leash so they can fight it out in 2016.
Lewis Hamilton is itching to return to racing and is hoping he "floats like a butterfly and stings like a bee" in Australia.
Find out everything you could ever want to know about the Australian GP as the F1 season starts once more in Melbourne.
Pirelli have revealed drivers' first selections under 2016's tyre rules - but there will be little variety in Australia.