I think Cheika and his acolytes will make two changes for the test at Dunedin; TK for Kerevi and TPN for Moore (though that is probably a bit more problematic as they might want to finish with TPN).
Bearing in mind what I perceive to be weaknesses, particularly with the backrow and the defensive patterns in the backline, and being limited to the existing squad I'd prefer to see:
Sio, TPN, Ala'alatoa, Arnold, Coleman, Hanigan, McMahon, Timani, Genia, Foley, Speight, Hodge, TK, Folau, DHP.
Bench : Uelese, Faulkner, Kepu, Douglas, Hooper, Powell, Meakes, Beale.
From outside the squad, I would prefer to see Higgers at 6, Lance at 10.
Edit : The most important change would be to ditch the present defensive strategy and just go back to basics of numbering up on the opposition and getting up quick in their faces. No huge thing, but imo would prove to be a whole lot more effective than the Wallabies' defense has been for two years now.