100,000 Miler, Each country has a different fare for RTW, so the $2000 fare is specific to SYD. YOu CAN buy this fare in Canada BUT must start your RTW in SYD.
As mentioned the AC portion of the RTW will be upgradable for you under the same rules as for any other ticket booked in "H" class.
The FT Forum for "star" ( as in star alliance) under FlyerTalk MIles has loads of informaion on RTWs. Good Luck.