Yes, the Morumbi Stadium is located in Sao Paulo. The media has reported the october shows extensilly today, but no one mentioned Rio before, so I guess this is new for me.

What I know is that other city is trying a third show (Porto Alegre), but it was a rumour from last year. Last time they toured in Brazil at These Days World Tour they did 3 cities: Rio, Sao Paulo and Curitiba (my hometown).

All the three shows went sould out in a really short time span. The Curitiba show remains these days as the second biggest show in city's history, AC/DC wons the first place (but anyway maybe if they putted out another 5 thousand extra tickets maybe they have gone equal).