Damn, people thinking this is going to be Xbox One levels? That seems really unlikely. Honestly for me at least getting a fully portable Wii U would pretty awesome in itself (especially if it happened to hit the $199 mark). Expecting it to be a super-charged Wii U, anything more will be a good surprise.
I really don't see how it's unlikely and how everyone should temper their expectations at such a low level.
We already know that it's going to be vastly more powerful than a Wii U. It's running games the Wii U could only dream of running (Dragon Quest XI or Dark Souls 3 for example). We know from multiple reliable sources that it can runs ports from pretty much every third party games without too many issues. Sure, these games will need to be downgraded, like Xbox/Gamecube games needed to be downgraded to run on PS2, but we're far from not having a powerful-enough console here.
That's not because there's a news, not even necessarily a bad one depending on factors we don't know yet, that we should all temper our expectations to unreasonable levels. Everyone was expecting slightly lowered Xbox One processing power, and that's likely what we will get at the end.