The most recent information about the Western release date for Game & Warioputs it somewhere in the first half of 2013. For Japan, however, the minigame (but not microgame!) collection has a firm release date. Nintendo of Japan is aiming its nose-and-mustache-shaped bow and targeting March 28.
There's still a lot we don't know about the Intelligent Systems-developed collection, so soon before its debut – like what's in it. So far, we've seen only four minigames: Fruit, Arrow, Shutter, and Ski.