The official Pokémon Rumble Blast site has updated to include more information on various aspects of the upcoming game, such as the story, the toy Pokémon and the kinds of in-game battles, as well as a media gallery and a news and strategy section. The visitors can also collect coins found at various locations throughout the official site and based of the amount of coins they collect, they can get various prizes. The prizes are the following:

• When visitors have collected 10 coins, a special wallpaper will be made available to them. The special wallpaper is also posted on our Pokémon Rumble Blast Wallpapers imageboard thread. (http://www.pocketmonsters.net/imageboard/thread/2606)
• The prize for collecting 25 coins is a special Toy Reshiram and Zekrom Screesaver for both PC and Mac.
• Finally, after all 45 coins have been collected, a special password will be granted to the visitors of the site that will unlock a Pokémon in-game. The password 77463878 unlocks Electric Boost Pikachu. Our password page has been updated with this password.

Source: http://www.pokemonrumble.com/blast