You will fly with Air China from Sydney or Melbourne to Beijing or Shanghai. After arriving back in Australia you can take a return flight to the same city as your first journey and you only have to pay the taxes.
Please note that you have to depart on your second flight no later than the 14th of November 2010.
All travel has to be completed within 1 year of your original departure.
Stopovers are permitted in each direction but not sure where you stopover with Air China, maybe if going to Shangahi you can stop in Beijing.
quite a weird deal but yeah this is a bargain for people who often fly to China