UPDATE - Looks like this is the real deal, as the Miiverse post has been found. Thanks to all that sent this in!
Which side of the argument are you going to be on? People around the web are trying to figure out if the image above is the real deal or not. We haven't heard anything about Tingle being a Mario costume in Super Mario Maker, but now this image is making people scratch their heads. I'm thinking it's fake, but I suck at guessing! Thanks to Overkill for the heads up.