Amazon.com posted the release date and box art for Pokémon™ HeartGold Version and Pokémon™ SoulSilver Version on the weekend. Nintendo's press release has now confirmed the information. Below is the press release from Nintendo.

REDMOND, Wash., Dec. 14, 2009 - Consumers nationwide continue to snap up Nintendo products for the holidays, and Nintendo is poised to carry that momentum into 2010. Dozens of games for the Wii™, Nintendo DS™ and Nintendo DSi™ systems are on the way in a wide range of categories from both Nintendo and its third-party partners.

On the portable side, Nintendo's hand-held systems will see the arrival of a number of diverse games, including the eagerly awaited Pokémon™ HeartGold Version and Pokémon™ SoulSilver Version on March 14. Pokémon HeartGold Version and Pokémon SoulSilver Version allow fans to return to the scenic Johto region first introduced in the beloved Pokémon Gold and Pokémon Silver games. The games have been fully enhanced with rich graphics, updated sound, new touch-screen controls and much more.

Source: http://press.nintendo.com/articles.jsp?id=21389