Look forward to them cutting content from games to sell as DLC, which is exactly what this smells of.
Coin Rush levels as DLC? Any other dev did this, we'd be decrying this as nothing more than a nickel and dime of their fanbase/a blatant cash grab, but Nintendo does it and it's them getting DLC 'right'.
Except Nintendo just said that's what they're not doing. To just assume that Nintendo will start doing this eventually when the company has no history of this yet is downright cynical.
And coin rush is side content anyway - if another dev did what Nintendo is doing and made it clear that none of the DLC stuff is cut content, why would people complain? Did people complain when PC games got expansions in the late 90s/early 2000s? No, because it was new content they were willing to pay for because they enjoyed the base game. That's what DLC should be. If the DLC was, say, the entirety of World 8, then people would have reason to riot.
And I know someone else made the argument that they could just be lying, but unless someone finds proof that the coin rush DLC levels were already on the NSMB2 cart, I see no reason to believe this.