Sorry, can't choose just one when there are so many I have on my list.
Nintendo (all on Switch): Super Mario Sunshine remake, a new Metroid (2D or 3D as long as it is good), a new F-Zero (with SEGA), a new Kid Icarus action-adventure game or Uprising sequel, a Mega Man (X) third person action game reboot with Capcom, a new Castlevania with Konami, a new collaboration with Platinum (W102, Bayonetta 3, new IP, new reboot of old Nintendo IP), a new WaveRace, a full-fledged new Double Dragon with ArcSys, StarTropics reboot as Uncharted-like action-adventure game, 3D Donkey Kong (Country) platformer (made by Retro).
Sony (all on PS4): Legend of Dragoon sequel or reboot, Panzer Dragoon (Saga) sequel or reboot with SEGA, Outrun 3 with SEGA + Yu Suzuki, a Skies of Arcadia sequel with SEGA, a Jet Set Radio sequel with SEGA, a new Destruction Derby, maybe a new quirky and colorful game that harkens back to earlier games like Parappa, Jumping Flash and Ape Escape, Demon's Souls 2/remake, Bloodborne 2 or a new FROM collaboration, My Summer Vacaction localised collection.
Microsoft: Scalebound being un-cancelled and re-announced as Scorpio launch title, an old-school Rareware 3D platformer or action-adventure game, any new AAA first party game that is not Halo, Gears of War or Forza.
Edit: bolded the ones I'd choose if forced to.