I'd just like to point out that I checked out the interview myself after it was linked.
While the interview does mention a "new Super Mario" on 3DS, it's not specifically mentioned with "Bros" at all, and the "new" itself, were it a "New Super Mario Bros" would have been listed as the title and put in English using katakana - "Nyuu" as is listed in plain English on the Japanese box art for both New Super Mario Bros. and New Super Mario Bros Wii.
Instead, they use the Japanese adjective for "new", as a "new Super Mario game". The non-capitalized new in the translation was correct.
So, "transcriber's interpretation" be buggered. Just the fact that there's gonna be a new Mario game is enough info, and we knew this was gonna happen anyway.