Every single WiiU First Party port for Switch so far added at least one new feature.
Mario Kart 8 Deluxe: Battle mode
Bayonetta 2: Local play + amiibo support
Captain Toad: Treasure Tracker: Super Mario Odyssey levels + DLC
Donkey Kong Country: Tropical Freeze: Funky Mode
Hyrule Warriors Definitive Editions: New costumes (+ all 3DS version content)
New Super Mario Bros U Deluxe: Peachette
Pokkèn Tournament DX: Decidueye, Darkrai, Empoleon, Croagunk, Scizor, new Support Pokemon, 3v3, Online
Tokyo Mirage Sessions ♯FE Encore: QoL, new Dungeons
Mario Kart 8 Deluxe: Battle mode
Bayonetta 2: Local play + amiibo support
Captain Toad: Treasure Tracker: Super Mario Odyssey levels + DLC
Donkey Kong Country: Tropical Freeze: Funky Mode
Hyrule Warriors Definitive Editions: New costumes (+ all 3DS version content)
New Super Mario Bros U Deluxe: Peachette
Pokkèn Tournament DX: Decidueye, Darkrai, Empoleon, Croagunk, Scizor, new Support Pokemon, 3v3, Online
Tokyo Mirage Sessions ♯FE Encore: QoL, new Dungeons