Tezuka: Yes. We also are planning additional courses.

Iwata: As with New Super Mario Bros. 2 for the Nintendo 3DS, you’re talking about the additional courses.

Tezuka: Yes. We’re trying to think of ways of play that are different from New Super Mario Bros. 2, but we haven’t made anything yet! (laughs)

Iwata: Right, rather than distributing content that’s premade at a later date, you’re going to start working on it now.

Iwamoto: Yes. The mechanism for adding courses is already there, so please stand by for an update on what they’ll be like.

 

Interview here