Sounds like a good way to get mainstream attention on a Direct.
The PEGI ratings board has listed Minecraft for Wii U, and it could release as soon as tomorrow.
The European game rating body has given the game a 7+ rating citing "non realistic violence toward fantasy characters" among other things, roughly equivalent to the E10+ in North America. The release date on the rating is 12 November, meaning it would likely be announced in tomorrow's Nintendo Direct if it was to come out as there is no mention of the game in this week's download PR.
PEGI has rated games that have not actually released, such as rating PlayStation Vita versions of Tales from the Borderlands where no version exists, but we will find out either way tomorrow more than likely.