According to the Brazilian newspaper Folha de São Paulo, the public registration to get Madonna tickets already has more than 160 thousand people registered. This registration is necessary to buy the tickets first via internet.
There are 110.000 people registered to buy the tickets for the São Paulo concert and 50.000 for Rio.

This registration includes only those who want to buy via internet. There are still tickets that will be sold in the Stadium and in specific points.

Time 4 Fun confirmed the third show on last Saturday (08/23). The new date is December 20. The site to register is www.ticketsforfun.com.br.

Only people that own Brazilian credit cards from Bradesco bank can register to buy tickets via internet.

Source: Drowned Madonna

Update:
Second São Paulo show is confirmed by Madonna.com.


Thanks to patlagik!