Australia preview - do Mercedes hold the ace cards?

Everyone has been dealt a new hand of cards for 2015, but all of Mercedes' rivals arrive in Melbourne for the season opener convinced that the Silver Arrows will still be holding all the aces.

Winter testing indicated that the new F1 W06 Hybrid has the speed to carry on where the W05 left off last year, but of course no one will really know if that's true until Saturday's qualifying session