Nintendo of Europe just put out a press released detailing the release of Mario Party: Island Tour in the region:
Mario Party: Island Tour: Mario’s latest party has a tropical theme, with seven new game boards and 80 new minigames, including some that use the motion controls of Nintendo 3DS, and the ability for four Nintendo 3DS owners to play all multiplayer game content with only one copy of the game via Download Play. Players can also engage with other players who have the title in StreetPass minigame competitions. The game is releasing on 17th January 2014.
There you have it! Mario Party: Island Tour is set to release in Europe on January 17, 2014. No word on Australia yet, but we will update this post when news comes in!