Nintendo Direct announced, 2.13.2019.

[zorg1000]

Bofferbrauer2 said:

PAOerfulone said:
I don't know about you guys, but I sure am hungry for a new 2D Zelda game. It's been 6 years since A Link Between Worlds and 4 years since Tri Force Heroes, I'm ready for the next one! Especially to help hold me over until the next Breath of the Wild type game that is going to take a loooong while before we see it.

While I would also love a 2D Zelda, I don't think the devs would have had enough time yet to develop one. Only one year has passed since the BotW DLC, that's clearly not enough time to develop a game.

In the meantime, you could play Zelda I and II on the Switch like I do

Zelda team usually works on multiple projects at once, for example Wind Waker HD, A Link Between Worlds and Breath of the Wild were at different stages of development concurrently. Also there is no way the whole team was working on DLC.