For the economic activity i reckon it will be on linkages and flows because they ammended the syllabus point on that in 2001 and it hasnt been tested yet... other than the nature of the local activity and the linkages etc every thing else has been examined in prior hsc exams.
For ecosystems i think it will be on the reasons for ecosystem management and protection (utility, intrinsic etc) and then evaluate in reference to your case studies traditional and contemporary management strategies. Or something allong those lines.
for urban places im not sure, either the dominance/ dependence between world cities and urban centres...demise of the small town. (i hope not)
or the challenges and response to these challenges of living in a mega city like self help projects, NGO's, informal economies etc