From Bulbapedia "It is believed by some that
remakes of the
Generation II games
Pokémon Gold and Silver will be produced during
Generation IV on the
Nintendo DS. The possibility of these remakes is based on
Nintendo's past remakes of the
Pokémon Red and Blue versions into
FireRed and LeafGreen in
Generation III. The remakes would take place in the region of
Johto (and later
Kanto) and the player's starting area would be
New Bark Town. It should be noted that Nintendo has not said anything officially on the matter, and that the content within this article is based on speculation and inferences made from perceived clues within the
Pokémon games and
anime.