Smash Bros - April 28th, MewTwo, mii costumes. Lucas in June, character ballot
amiibo tap in spring
Mario Maker in September, more ways to celebrate 30th anniversary
Yoshi's Wooly World: "mellow mode", yarn amiibo
Wii U virtual console:
DS - $7-$10. various control/config options including turning gamepad sideways. Yoshi's Island DS
N64 - $10-$12 ($2 upgrade from Wii). Mario 64. DK64 coming soon.
Mutant Mudds Super Challenge cross-buy
Don't Starve comes with two copies, one to give to a friend.
Pokemon Rumble World - free to start
Puzzle & Dragons Z + Puzzle Mario Bros demo
Codename STEAM updates
Street Pass Mii Plaza - two new games, "premium" adds some new features
new Fire Emblem - your character is the main hero, choose sides for different plots
Animal Crossing Happy Home Designer. You design rooms for people and invite characters with amiibo cards.
Mario Kart 8 - Animal Crossing DLC course changes seasons. More amiibo costumes. 200cc speed class. April 23rd.
The fact Mother 3 was even mentioned at all is suspicious as *crag*