Thanks to Manaman for pointing this one out! The official Seiken Densetsu PR Twitter account recently posted a short video showing 10 seconds worth of gameplay of Seiken Densetsu 3 on the newly launched Nintendo Switch. Interesting to note the border round the screen in the form of the world map artwork from the game to fill out the space.
The big question is now whether this means we will see an official English port of the game!
— 聖剣伝説 -公式- (@Seiken_PR) March 20, 2017