Through a trailer, SQEX had announced that they are bringing a port collection the first three Seiken Densetsu games (SD FF Gaiden/Final Fantasy Adventure, SD2/Secret of Mana, SD3) to the Nintendo Switch. It's out in Japan on June 1, 2017. Here are details from the site itself, and below is a trailer for your enjoyment. Who knows, this port collection might end up being released overseas, which would give us Westerners the first chance to play the third official Mana title. But that's just my wild hope.