There's a DP from a blog that the old routing rules will be grandfathered if you need to make routing changes from Sept. 1 [MENTION=825301]Vaguswarrior[/MENTION]
Brief update: I called Aeroplan to confirm that 24-hour layovers and custom routings will remain in place after September 1 (for now). Only the stopover policies have changed. Furthermore, any itineraries ticketed before September 1 will remain subject to the old rules, even if you make changes after that date.
https://princeoftravel.com/blog/big-...-mini-rtws-now