It will be a couple Nintendo games, whichever are the closest to be ready (probably already are, and shelved until release).
- 3D Mario
- Mario Kart
Metroid Prime 4 first year, but maybe not for launch.
Third Parties will want to put games at launch because they know these will be long sellers on Nintendo consoles, so every third party is going to port whatever they released recently.
SEGA : Sonic & Shadow Generations enhanced/optimized, Persona 3 Reload, Metaphor, maybe a Yakuza port
Capcom : Resident Evil 4 not cloud edition, then probably 2 and 3 at some point, Street Fighter 6
Square-Enix : Final Fantasy VII Remake part I and II, maybe XVI at some point
Konami : Bomberman or Metal Gear or Silent Hill or Castlevania in some form
Namco : maybe Elden Ring, Tales of Arise and whatever anime fighting game they are making right now
Koei Tecmo : probably an exclusive game made for Nintendo, otherwise there is a Dynasty Warriors in the works
Ark System Works : Guilty Gear
Many of these should be heavily downgraded ports, so some games might simply not make the cut