I think I can answer a few of these.
3. Yes, they could before and should be able to now especially since Liches can become them. (Correct me if I am wrong on any of these)
4: Tier 5 most likely
5: They were weak to Fi' before probably will be now.
6: If they don't touch the gold
7: They can wear armor (Or they could before) though it makes them loose all magic (Or it did before), and probably will make them slower. EDIT: The Elder Wraiths are lightly plated in armor, so probably only light armor
9: They can wield normal weapons of course, as they are not that weak, unsure about mages.