This competition, named after the number of national teams that participate in it, is held annually and began in 1996. In all likelihood, the competition will be expanded in 2012, with the addition of one more country (yes, the name of the competition will also change). This will also add a new continent to the two continents already represented.
What sporting competition, and who is the latest addition?
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The Tri Nations Cup, a Rugby Union event involving Australia, South Africa, and New Zealand. The latest addition will be Argentina.