Well, everyone it looks like the mushrooms will have to wait. Nintendo has announced that if you purchase New Super Mario Bros. 2 from the eshop, you will get some extra coins to use on Club Nintedno. You will get a total of one-hundred extra coins if you make your purchase from the eshop but they have also said if you do not purchase the game from the eshop you can still get fifty coins for rewards purchases- which is still a good deal.
In order to get the game though the eShop you must make sure you have a 3DS account that is connected with Club Nintendo. Nintendo are launching both versions at the same time (August 18th), and those extra coins make for a great incentive to go digital.