iGame is a division of an ISP called iBurst down there, and they say they're prepared to run an official server (within 24 hours' notice!) if Blizzard gives the OK, but Blizzard has told them that they need at least 40,000 players in the area to make it worth running an official server.
There's another option called a "peering" server, which apparently does hook up to Blizzard's servers, but uses local connections and networks to make things a little faster. But again, Blizzard needs to assent to that, and it seems like they're hesitant at the moment.
Oceanic realms have had issues for a long time, but at least the players there do have a chunk of servers dedicated to them. Are there any other major places in the world that don't have official WoW support yet? South America? India?