Nintendo will host a Video presentation at E3 2018 featuring games releasing in 2018, 3 days of treehouse streaming

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Miyamotoo said:

About this Games launching beyond 2018 will be "featured" at a later date, part, have on mind that Nintendo used similar (not same) wording for last E3 and some previous Directs and we always get more than they said we will, so I again definitely expect few 2019. announcements/showings in any case.

Even if they focus on 2018-only titles, it means later we'll get a hyped direct showing us 2019 and beyond games.

 

It's a win-win situation.