Just to put this to bed, the date actually
does have something to do with the release. The 30th Anniversary of Super Mario Bros. is on September 13th 2015. That falls on a Sunday this year, and retailers only put out new products - including the game marking the 30th anniversary of Super Mario Bros. - on Fridays. That's why it is what it is.
So, it's something you read in the K. Rool thread recently, then?
Go on, spill the beans. It might very well be relevant to Bandana Waddle Dee discussion - certainly more so than Super Mario Maker's release date.
Though, speaking of Bandana Waddle Dee
and Super Mario Maker, we now have confirmation that there are definitely non-Amiibo-related costumes in the game (as proven by the Pikmin having a separate one from Olimar himself). This could mean that there might already be a Bandana Waddle Dee one in the game, even without him having an Amiibo.
Is anyone planning on making any BWD promotional levels, whether this is so or not?