Nintendo have release various details about NSMB2 around the world including eShop bonuses and story details…
Nintendo of Japan NSMB2 Bonus
For those lucky Japanese gamers, if they buy NSMB2 via eShop before September 2nd, they’ll recieve “Donkey Kong Original Edition” (including Pie Factory stage) free of charge!
Nintendo of America NSMB2 Bonus
Nintendo of America have confirmed that gamers who purchase NSMB2 via the eShop will receive double the coins on Club Nintendo! You will have to buy the game before September 20th and fill in a registration form, a very easy feat for any Nintendo Enthusiast out there!
Story Details from the NSMB website
Trouble always seems to find its way to the Mushroom Kingdom! Just as Mario™ and Luigi™ go off on a coin hunt in the sky, their beloved Princess Peach™ is kidnapped by the dastardly Koopalings. The brothers have to venture through over 80 stages to rescue her, grabbing an endless deluge of coins across land, water, air, and snow along the way.