The release date for the US version of the recent HeartGold and SoulSilver has been announced for March 14th, 2010 - the PokéWalker will be included.

Pokémon HeartGold/SoulSilver are (as you should all well know) remakes of the popular Pokémon Gold/Silver versions for the Game Boy Color. Being released in the US on March 14th, 2010, most will probably be pleased to know that the PokeWalker will be included. Some of you will probably know that the PokéWalker is a pedometer-like device that allows you to raise your Pokemon as you walk around, much like the in-game day care works.

  

The US box art is almost identical to the Japanese version.

Source: Amazon listings for HeartGold and SoulSilver