On the morning of July the 10th Nintendo dropped a 15 second trailer for what appears to be a new horror game which you can view here.

The video description simply contains “#Whoisemio” . A simple Google translate reveals the text in the video as “Smiling man”. The Australia rating for this game has it at an MA 15+/Restricted 13 for strong themes, violence, suicide references/themes, cruelty, and domestic abuse.
Who is Emio? Is he wearing the bag? What has he done with Mario? Comment below with your theories.