Looks like the story will be a huge part.
http://www.nintendoworldreport.com/news/47282/rhythmic-runner-lost-in-harmony-striking-switch-chord-june-21
Next month will see the debut of another rhythm title for Switch.
Playdius has announced that they will publish Digixart Entertainment's rhythm adventure Lost in Harmony on Switch June 21. A multiple award winner on mobile platforms, the Switch version will have full Joy-Con functionality including HD Rumble.
An endless rhythm runner, Lost in Harmony features a story penned by writing staff from 2014 Ubisoft title Valiant Hearts and a diverse musical influences that includes Wycleaf Jean and video game composers.