Global Voices Online has a suberb summary of a number of blog posts about the rapidly expanding Brazilian presence in Second Life. Brazil is such a huge and culturally powerful country (a sub-continent, really), I could see its people taking over major chunks of SL if they wanted to, similar to their pwning of Orkut a couple of years ago.
I think SL could use a stronger international flavor, forcing folks to interact with people from all over the world and work on their cross-cultural and linguistic skills. My Portuguese is terrible so I could use the practice, for sure.
Hell, Carnivale already beats anything virtual worlds can produce for sheer spectacle, sexiness and explosive energy. Boa vinda, Brasileiros!