I guess I'll just throw some predictions
New Kirby game (because *ahem* we all just saw what happened) and a collection of five GBA thru Wii era Kirby games to celebrate Kirby's anniversary next year :) The collection will release in January or February, and the new game will release March, April, or May.
A a major Animal Crossing update that releases in November
A major update for Mario Golf
New trailers for Metroid, Mario Party and Advance Wars
New trailer for Splatoon 3. No specific release date mentioned
A bunch of trailers for 3rd party games one of which being SMT V
N64 and Gameboy will be added immediately to NSO with Nintendo saying that GBA support will come next year
Earthbound Beginnings and Earthbound will be released later this year, but not through NSO. You will have to buy them separate from that service
My wildest prediction will be that an old Fire Emblem game will get a remaster, my guess is Path of Radiance will be the game.
And my final prediction is that everyone will be disappointed