The latest Pokémon TCG expansion set: HeartGold & SoulSilver, was officially announced today. The expansion is the English regional version of the HeartGold & SoulSilver set that was released last year in Japan on October 9th, 2009. Below is the press release from the announcement.

Pokémon are the heart and soul of any great Pokémon Trainer, and now is your chance to catch some of the greatest Pokémon of all time with the all-new Pokémon Trading Card Game: HeartGold & SoulSilver! New kinds of cards will change the way you play—like Pokémon Prime and the astonishing Pokémon legends Ho-Oh and Lugia—plus you’ll find lots of Trainer cards that will accelerate your game and select Energy cards with a brand-new look. The HeartGold & SoulSilver expansion will get you started on your journey to greatness!



With more than 120 cards in all, the brand-new Pokémon TCG: HeartGold & SoulSilver expansion will arrive in stores nationwide on February 10, 2010.
* All-new card designs that give the set a unique look
* Introducing 2 dual-card Pokémon LEGENDs (Ho-Oh and Lugia)
* Discover 6 amazing Pokémon Prime (Ampharos, Blissey, Donphan, Feraligatr, Meganium, and Typhlosion)

Source: http://go-pokemon.com/tcg/cards/hgss/01/