If they did so it would likely be for the bedrock edition methinks. Not the old Switch Edition. Quite frankly I'd rather see them focus on adding keyboard and mouse support if they're going to go out of their way to include special controls on the console editions.
EDIT: Well I watched the whole stream where they mention gyro controls and they did say they'd love to add keyboard and mouse controls but it has to be first supported by the hardware itslelf. They can't add it into the OS themselves it has to come from Nintendo.
What they didn't say is that keyboards are already supported by default on Switch, USB keyboards, but as far as I know they're only supported to type in text whenever the on screen keyboard API is active. I guess it can't be used for anything else at this time. As for mouse support, Nintendo has no reason to add it in unless devs request it or offer to partner with them to bring it, so I guess unless things move forward in that direction, support for those in Minecraft won't happen on Switch anytime soon.