The latest 5th Generation Pokémon games, Pokémon Black and White (ポケットモンスター ブラック・ホワイト), released in Japan on September 18th, 2010, have already broken the Japanese sales record for the most copies sold in a two day span. The games combined for a total of 2,637,285 copies sold. The games had over a million pre-orders to start but the sales exceeded all expectations. The games will be released worldwide in the Spring of 2011.

Source: http://www.famitsu.com/news/201009/21033916.html