The majority of the stakes in South America were created between 1990 and 2000. In the past eight years, the majority of the stakes created were primarily in four countries: Brazil, Colombia, Peru, and Venezuela. Although membership and congregation growth rates have slowed since then, membership is becoming more mature and "seasoned." Once this occurs, the number of temples in South America should increase dramatically.
Above I posted a map of South America with the yellow dots representing existing temples, green dots representing temples which are very likely to be announced, and purple dots representing temples which are not as likely to be announced as soon as the green dot temples.