EarthBound 3 announced for switch

Japan only obvious

The reason for Mother 3's inclusion in this Direct is likely due to the involvement of creator Itoi Shigesato, meaning that this is technically a collaborative project with a third party.

As for why the game isn't included in the West, the usual alleged reasons are being bandied about, like the game not already having been previously localized, and controversially dark themes and the main party tripping on mushrooms at one point.

There are also “problematic” representations in “transgender” characters called the Magypsies, despite the lattermost not even being human beings, and are crossdressing okama.

It seems like Mother fans in the West will have to wait for yet another chance.