Nintendo Switch has been updated to version 12.0.0 and this comes with some hidden changes as discovered in the datamine of the firmware.
While the official changelog for this firmware mentions that it is related to the save data backup feature. There was an issue with this feature that resulted in the data not being backed up and getting interrupted in the middle, which has been resolved now with the new firmware update.
We fixed the issue with the save data backup feature, where in rare cases, the automatic backup of save data is interrupted if a communication error occurs during completion of the save data backup process.
This is listed on the official support website. However, according to users who have managed to datamine the new additions in the firmware, there are some internal changes that could be in preparation for the rumored new 4K Switch.
the 12.0.0 update sounds like it has some more support for the Switch Pro, along with a new IPC protocol breaking Atmosphere compatibility
— Nikki™ 🌹 (@NWPlayer123) April 6, 2021
Another popular modder suggests that this update has added the ability to update the dock for the Switch. This could be one of the features that can be potentially used in a new hardware revision. It has been rumored that the new Switch will come with an updated dock that can output in 4K.
[Nintendo Switch System Update]
It appears that update 12.0.0 has added the capability for the Dock’s internal firmware to be updated.
Can’t see an obvious reason why.
— OatmealDome (@OatmealDome) April 6, 2021
However, all of this is pure speculation at this point. While it is certainly possible that this new reference has been added to the Nintendo Switch with a firmware update, there is no official announcement of a potential new hardware revision so we can only speculate for now.