Here we have the Pre-Release pictures for Pokemon  Heart Gold & Soul Silver. Pictures from the official website and Serebii.

• Gold, Chikorita & Silver in New Bark Town
• Gold, Chikorita & Silver in New Bark Town
• Gold, Chikorita & Silver in New Bark Town
• Coro Coro showing Male and Female trainer
• Menu on the Touch Screen
• Selecting Your Starter
• Gold & Chikorita in New Bark Town
• Gold & Cyndaquil in Ecruteak City
• Gold & Totodile face off a Rocket by Slowpoke Well
• Sprout Tower
• Gold & Pikachu Coloured Pichu meet the Notched Ear Pichu
• Select you starter - Cyndaquil
• Select you starter - Totodile
• Navigating the Box via Touch Screen
  
• Navigating the Pack via Touch Screen
  
• Navigating the Pokédex via Touch Screen
  
• Navigating the Status Screen via Touch Screen
  
• Gold & Wobbuffet in a Route
  
• Gold & Steelix in the Ruins of Alph
  
• Gold & Larvitar in a Gate
  
• Gold VS Silver
  
• Team Rocket outside Goldenrod Radio Tower
  
• Team Rocket inside Slowpoke's Well
  
• Gold & Pichu enter Ilex Forest
  
• Gold & Pichu on a Route
  
• Cynthia tells you Arceus is giving you a choice
• Gold meets the Female Trainer and her Marill
  
• Gold & Professor Elm
  
• Selecting Pikachu to send to the PokéWalker
  
• Checking Pikachu on the PokéWalker
  
• Gold & Hoothoot in a Route
  
• Gold & Teddiursa in a Cherrygrove City
  
• Gold & Chikorita in New Bark Town
  
• Gold & Cyndaquil in New Bark Town
  
• Gold & Totodile in New Bark Town
  
• Ho-Oh flies to the Tin Tower
  
• Lugia deep in the Whirl Islands
• Igglybuff & Marril VS Notched-Ear Pichu & Pikachu Coloured Pichu. Courtesy of Filb.de
  
• Gold & Arceus in the Ruins of Alph. Courtesy of Filb.de
  
• Gold & Arceus enter Shinto Ruins. Courtesy of Filb.de
  
• Arceus is surrounded by Unown. Courtesy of Filb.de
• Ho-Oh on the title screen
  
• Lugia on the title screen
  
• Totodile battles Geodude
  
• Chikorita battles Mareep
  
• Typhlosion & Meganium VS Tyranitar & Feraligatr
  
• Walking through Ecruteak City
  
• Walking through Violet City
  
• An unknown gym, possibly Blackthorn City, puzzle
  
• Facing Morty in Ecruteak Gym
  
• Tyranitar uses Rock Smash in Cianwood City
  
• Surfing in the Lake of Rage
  
• Battling the Red Gyarados
  
• The Pokéthlon Building
  
• The Pokéthlon - Dash Hurdles
  
• The Pokéthlon - Dash Hurdles
  
• The Pokéthlon - Bounce Field
  
• Facing Lugia in Whirl Islands
  
• Facing Lugia in Whirl Islands
  
• Facing Ho-Oh in the Tin Tower
  
• Facing Ho-Oh in the Tin Tower
  
• Coming Across Entei
  
• The Pokéthlon Stats for Cyndaquil
  
• The Pokéthlon Reception
  
• Pokéthlon Event - Dash Hurdles
  
• Pokéthlon Event - Bounce Field
  
• Pokéthlon Event - Snowball Shoot
  
• Pokéthlon Event - Ring Out
  
• Johto As Shown in the PokéGear
  
• The PokéGear Itemfinder
  
• The PokéGear Radio
  
• Dialga uses Metal Burst
  
• Palkia uses Hydro Pump
  
• Giratina uses Shadow Sneak
  
• The New Menu with 2 items registered
  
• Kurt's House
  
• Goldenrod City
  
• Ecruteak City
  
• Gold & Eusine in the Brass Tower
  
• Entei, Raikou & Suicune in the Brass Tower
  
• Your Mom Saves Money
  
• Sending Money to your Mom
  
• A Kimono Girl in Violet City
  
• A Kimono Girl in Ilex Forest
  
• A Kimono Girl facing off a Rocket
  
• The PokéGear Phone
  
• Placing Notes on the Map
  
• The new Azalea Gym
  
• The new Goldenrod Gym
  
• The new Ecruteak Gym
  
• PokéWalk - Selecting Pokémon Captured in PokéWalk
  
• PokéWalk - Details of PokéWalk captured Pokémon
  
• PokéWalk - The Log
  
• VS Kyogre
  
• VS Kyogre
  
• VS Groudon
  
• VS Groudon
  
• VS Rayquaza
  
• VS Rayquaza
  
• The Entrance to the Battle Frontier
  
• Inside the Battle Frontier
  
• The Pokéthlon - Break Block
  
• The Pokéthlon - Charge Relay
• The Pokéthlon - Push Circle
  
• The Apricorn Juicer
  
• Finding the Aprishakes
  
• Chikorita's Pokéthlon Stats Are Raised
  
• The Berry Planter
  
• An Apricorn Tree by Kurt's House
  
• The Special Safari Zone area
  
• The Sand Area of the Safari Zone
  
• Customising the Safari Zone
  
• Customising the Safari Zone
  
• The Magnet Train arrives
  
• In Vermillion City Harbour
  
• Kurt
  
• Professor Oak in Mr. Pokémon's House
  
• The Bug Catching Contest
  
• A Capture in the Bug Catching Contest
  
• On the Bike in Goldenrod
  
• In Goldenrod
  
• In a Pokémon Centre
  
• In Violet City
  
• The New-Look Box
  
• Heading to Kanto
  
• Gold & Typhlosion in Route 1
  
• Gold & Typhlosion in Pallet Town
• Olivine City Gym
  
• VS Growlithe
  
• A Wi-Fi Battle
  
• Learning A TM
  
• The Global Trade Station
  
• The Battle Hall
  
• The Wi-Fi Plaza
  
• Entei Headbutts A Tree
  
• A Wi-Fi Battle
  
• A Wi-Fi Battle
  
• Soul Finds Suicune
  
• Violet City Gym
  
• VS Jasmine
  
• Riding A Bike
  
• In a Lookout Point
  
• Gold & Tyranitar
• Red Gyarados appeared in the lake
• New, improved Pokégear
• New Johto Town Map
• Berry Bond Link
• Safari Zone Shops
• PokéWalker

• Map of Johto

Pictures from Serebii