In the latest edition of Iwata Asks the focus is on New Super Mario Bros. 2 on Nintendo 3DS - a game that used to go under the name - New Super Mario Bros. Gold. It is Yusuke Amano, answering Iwata's questions.
Iwata: Did you decide on the title pretty easily this time?
Amano: Because of the focus on coins, we considered including "Gold" in the title.
Iwata: New Super Mario Bros. Gold?
Amano: Yeah. But it has more stages than the Wii and Nintendo DS games, and a lot of new elements, so it holds plenty of fun as orthodox Super Mario.
That title would probably have created a certain degree of confusion, as many would have believed it to be re-issue of the original New Super Mario Bros. So now it's called New Super Mario Bros. 2 - and coin rush is still a big part of it.