It's actually a pretty cool concept. It's not a team management game like most sports titles. Rather, it's a bit like EA Sports' quasi-recent Superstar mode trend. That it is to say, each player will control one athlete who improves and learns new moves over time. Every athlete on the field in every match will be controlled by a human player, and those players will be able to invite their friends to join them in the middle of any match.
Interzone chose to launch in Brazil first because ... well, if you can't answer that, you don't know much about soccer. Or Brazil, for that matter.