New Super Mario Bros. 2 is an upcoming side-scrolling platform game for the Nintendo 3DS set to be released in Japan on July 28th 2012, Europe on August 17th, Australia on August 18th and the US on August 19th. It will be the thirteenth title in the main Super Mario series, the eighth title to be a Super Mario Bros. installment, the third in the New Super Mario Bros. line after New Super Mario Bros. for the Nintendo DS and New Super Mario Bros. Wii for the Wii and the sequel to New Super Mario Bros. The game was announced by Satoru Iwata in a Nintendo conference in April 21, 2012. The game seems to be heavily based on Super Mario Bros. 3, as it features Raccoon Mario, and the P-charge bar, both of which were introduced in said game. It also combines elements from New Super Mario Bros. and New Super Mario Bros. Wii, as this is a follow-up to those games.
According to Nintendo, New Super Mario Bros. 2 will be the first Nintendo game (and specifically the first Mario title) to be purchased and digitally downloaded through the Internet. The game can be stored onto an SD card, along with multiple other games, and be played on the Nintendo 3DS, but they can’t be shared with other Nintendo 3DS handhelds. It is also revealed that the game’s overall goal is to collect one million coins.
Source: Wikipedia, Youtube