I wanted to send some links that may be helpful for you, or people you know, who are coming to Brazil for the World Cup.
For a complete travel guide to the Brazil World Cup cities, you can visit this site: Protected content
To a more specific guide to activities and information about Rio de Janeiro, visit: Rio Uncovered - Protected content
And for those spending time in São Paulo, especially when England plays their game there, I welcome you to visit this blog that my friend and I have created to help organize activities for visitors staying in the city for a few days. It is: Protected content