I think we could see more 3 stoppers than you think in Australia this year. Pirelli have made the tyres a bit softer this year in the hopes of increasing the pit stops and improving the lap times (0.5 secs/lap)
Last year in Australia it was Button, Vettel, Hamilton on the podium. Both McLaren's went Soft Medium Medium and Vettel went Soft Soft Medium
you'd think that whatever laps they lose by running the super-soft instead of the soft they will just split up between the medium tyres and run SS / M / M. But if the tyres are softer they wont go as far.... could be interesting watching some teams try to stretch the tyres like Ferrari did at Montreal last year.
I can't wait for the season to start so we can see what the tyres will really be like....