No E3 Conference for Nintendo this year - Mistake or not?

[WagnerPaiva]

Seece said:

So Nintendo have announced their E3 plans. No conference, but they are having Smash playable at Best Buys across the US, a Smash tornament, a nintendo direct and a "tree house" at E3 (just a place for show goers to go see the devs themselves.

Is this a mistake? Should Nintendo be having a conference this year??

I want to know what is that TREEHOUSE thing