Could this be another example of online advertising presaging the onset of a hardware upgrade from Cupertino? Apple's ads on Australian tech pub PC Authority have been spotted displaying some rather peculiar price tags for its flagship mobile and desktop computers. Whereas Cupertino's Aussie online store lists the most affordable versions of the MacBook Pro, MacBook Air and Mac Pro at A$1,599, A$1,999 and A$3,599, respectively, the ab