Ok, my turn;
Wii U:
Splatoon is still for May in US. DLC & Amiibo interaction
XCX is coming in july.
Yoshi's Woolly World is coming in June as rumored.
Devil's Third is also for July.
Mario Maker for fall, amiibo interaction to make Toad, DK, Bowser, Peach etc playable.
More Wii games for Wii U, including The Last Story, Pikmin 1&2, FFCC Crystal Bearers, RE4
Remaining amiibos in June
3DS:
Announcement for next N3DS exclusive game for N3DS (I can't guess what this could be, all I think of "enhanced" stuff)
Fire Emblem If in September and FE amiibos
Rhythm Heaven in August
New color for N3DS XL in US, new covers for EU & JP including Rhythm Heaven and Fire Emblem ones.
Mario & Luigi 5 for 3DS, slated for fall release.
Bravely Second and Final Fantasy Explorers for fall release.
Etrian Odyssey 5 for 3DS in JP. Compatible with amiibos.
Monster Hunter 5 for 3DS for Japan. Just a teaser. Full info at MH event end of the may.