Game Freak Pokémon director, Junichi Masuda, is scheduled to appear on Japanese Pokémon show Pokémon Smash September 18th to make a "shocking announcement." By all appearances, the degree to which you'll actually get a charge from the reveal appears to be how excited you are by Pokémon Wii game PokéPark.
The timing suggests that Masuda's announcement relates to a second PokéPark.
Japanese magazine CoroCoro has confirmed that last year's PokéPark: Pikachu's Adventure will be getting a sequel, PokéPark 2: Beyond The World, which is due for release in Japan this winter.
According to CoroCoro the follow-up will feature Pokémon from Black and White's Unova region, plus a four-player multiplayer mode.