After a promised March launch, Nintendo said in an earnings report that Animal Crossing would be delayed until "the next fiscal year." However, the WSJ report puts a more precise time-frame on it, indicating an arrival in the "latter half" of 2017.
The company recently released Fire Emblem Heroes on mobile, and launched Super Mario Run late last year. A Zelda game could be its biggest mobile hit yet, however, judging by The Legend of Zelda: Breath of the Wild, the Nintendo Switch console's breakaway hit. That title is so popular that Nintendo has sold more copies of it than Switches, thanks to a shortage of the console hardware.
While there's no release date yet on the Zelda mobile game, it looks like it would arrive sometime in 2018. There' also no word on whether it would be free-to-play with in-app purchases like Fire Emblem or paid like Super Mario Run, which costs $10 on mobile. So far, Nintendo has made a relative pittance ($176 million) on mobile games, so it may wait to see which strategy works best before deciding on its strategy for Zelda.