I was more than excited to see this from Game Informer:
This is just a testament to how much Nintendo is working to embrace new technologies and commit to it's titles after launch. They're even adding in Nintendo curated levels and creators, including some of the levels we've only read articles about from public events.
I always got frustrated with long courses and hesitated in creating long levels due to lack of checkpoints. But that coupled with blocks that react to the state of the player makes for huge new possibilities for Mario Marker.