I'm thinking a Partner Showcase or a Mini. But as I was putting together this post... I think they could do one more proper Direct just for Switch if they really wanted to. Like,
really wanted to. Looking at their known first-party release lineup for the period that Directs cover (next 6 months, plus a handful of further out stuff):
- September: The Legend of Zelda: Echoes of Wisdom (could get a new trailer)
- October: Super Mario Party Jamboree (could get a new trailer)
- November: Mario & Luigi: Brothership (could get a new trailer)
- December: Nothing (potential for a new game to be announced for this slot)
- January: Donkey Kong Country Returns HD (could get a new trailer; albeit part of a sizzle reel section)
- February: Nothing (potential for a new game to be announced for this slot)
- March: Presumably the launch month of the successor (potential for a new game to be announced for this slot regardless)
- April-June: Metroid Prime 4: Beyond, probably (could get a new trailer, but doubt it would; potential for a second game to be announced for this Spring launch window)
So new trailers for three-to-five known games, and possible reveals for two-to-three Switch games that can act as tentpole announcements.
That said, I'm sticking to my Partner/Mini vote. After all, they could have done a regular Direct in February but decided against it; maybe because
Echoes of Wisdom was seen as the only "big" reveal they could have done that would have lived up to the expectations they know that the normal "Nintendo Direct" label has: they weren't going to open or close a general Direct with
Endless Ocean or
Nintendo World Championships: NES Edition. And I think a September Direct could be in a similar situation, where
Fire Emblem 4: Genealogy of the Holy War might be the only big Switch title they've yet to reveal for H1 2025, so Nintendo might decide it isn't worth it to do anything more than a Mini or Partner Showcase.