Each game is bundled with a PokeWalker, a pedometer and modern Pokemon Pikachu. The extra item won’t bump up the price of the game. Pokemon HeartGold and Pokemon SoulSilver cost 4,980 yen ($50) a piece, the standard Pokemon game price.
Nintendo has not announced Pokemon HeartGold and Pokemon SoulSilver in North America at this time, but they already trademarked both names. Anyway, it’s not like Nintendo of America would pass publishing a Pokemon game.