No spoilers below, don't worry.
As for the spoilers, I believe the article for two reasons.
1. Reputable site has it.
2. They say they aren't copying a genre, buts its a new genre. Nintendo says this crap all the time.
Thus since I believe its real. Sweet, sound great, and add these to what we already know and Nintendo already has a great showing imo.
Only downside is, people will downplay it cause it wasn't a "surprise" now. Hell even I'm kind of dissapointed that I wont' be surprised during show. I mean sure I was surprised just now, but...
DON'T OPEN SPOILERS PEOPLE. DO YOURSELF A FAVOR AND WAIT 1 1/2 HOURS.