Fake leaks, sure but I am not seeing so many of those go wide and most leaks just seem to lack context*. Patents are very much fair game though -- it speaks a lot to the eventual abilities and, these days at least, control, network and even some software (Sony had a few of these for their trophments and DLC for "classic" games) approaches that are going to be used, or at least heavily considered. To my mind they are far better than sales even.
*the anti second hand/sharing stuff MS was considering for the xbone leaked in various forms way ahead of that presentation. Turns out it was worse than people feared from the leaks once the context was offered but was still something. It could be that game companies are predictable and you can make up leaks (my prediction for all game consoles these last few years was they make hardware about that of a similarly priced PC, give or take a loss leader/making it up on software, and thus far I have been right but nobody would have bet otherwise) but I am not about to dismiss things entirely.
"Attach rates for games like MK or Smash"
Where does that list end? We are probably still counting on one hand before it gets iffy and will not need a third before that list reaches way too far. To that end I have to wonder if the wii next is only going to be a smash and mario kart machine then would it be similar to me dropping silly money on an arcade machine (and depending upon the arcade machine a wii next + a couple of controllers and accessories plus the games is not far off)?
"And yes Nintendo Marketing dep. is unarmed against this attacks..."
Against low level and persistent grumbling and apathy? For the most part it is the opposite of hype and hype is probably the bread and butter of any marketing department worth considering. Fake scandals, it is a potent tool (
http://www.cracked.com/article_16656_6-brainwashing-techniques-theyre-using-you-right-now.html did my favourite basic writeup of the concept).
If such techniques can sway me (and frankly the only reason for me to buy a console on day 1, or even year 1, is to stick it in the cupboard for eventual hacks or because it is a cheap media player) then I probably deserved to be swayed.
All in all though I am still not sure why I should be worried, concerned or even trying to prevent/dissuade such discussion.