http://www.serebii.net/index2.shtml
Contains MAJOR spoilers.
Here are the Legendaries; be warned as you may wet yourself in anticipation: http://www.serebii.net/heartgoldsoulsilver/legends.shtml
Again, MAJOR spoilers for the starters; there is MORE THAN ONE SET YOU CAN OBTAIN: http://www.serebii.net/heartgoldsoulsilver/starters.shtml
Gym Leaders revealed (like we've already known): http://www.serebii.net/heartgoldsoulsilver/gym.shtml
It also seems that there a NEW Team Rocket Administrator...and he goes by the name of "Lance." It is mentioned on the first page. Whether or not this is the Champion Lance is not known...
EDIT: It seems that the new Team Rocket Administrator is named Lance, but by no means is he related to the Elite Four Champion Lance; his English name could be something else, but his name as "Lance" was roughly translated and is subject to change with the English version.
EDIT 2: Rocket Admin Lance is shown on PokeBeach's last picture: http://pokebeach.com/
