https://nintendoeverything.com/reggie-says-nintendo-has-internal-expectations-about-when-metroid-prime-4-will-be-released-more/

On whether Nintendo has an idea of when Metroid Prime 4 will be coming out…

“Internally, we have expectations about when [Metroid Prime 4] is going to be released.
We haven’t announced it, but yeah, the game is well in development.”

On how Nintendo approaches game announcements…

“Typically six months to maybe a year out is what we like to do, but there are times for strategic reasons that
we believe it’s important to message that a game is coming. We did that years and years ago with Zelda.
We were messaging a new Zelda experience back during the days of the Wii U… It really depends on the game,
it depends on the type of development that it’s going through,
and it depends on how we feel the consumer is going to respond to the particular message.”