As spotted by Mike Heskin, the firmware update adds "preliminary support" for a new console with the codename "nx-abcd".
That may seem like a random compilation of letters, but to the avid Nintendo fan, seeing Nintendo mention "nx-abcd" is very exciting indeed.
To make sense of all this, and to get to grips with the possible new version of the Switch, keep reading...
Nintendo Switch Pro revealed?
The "NX" was Switch's original codename, so seeing a new series of letters after "NX" in this update suggests that something new is coming on the hardware side.
Previous consoles, including devkits and 2019's Switch Lite have been referred to as the nx-abca, nx-abcb and nx-abcc, so the new codename is in keeping with the current convention.
Nintendo Switch Pro could have two screens?!
That's not all, though – Heskin also notes that there's evidence of a "secondary display of sorts" that'll be part of this new hardware. Does this mean the Switch Pro will have two screens?
While that does sound a bit like Nintendo's DS line of systems, there's also a chance that it could be a screen for menus, notifications, or a decent way to chat with your friends without resorting to Nintendo's app.
Nintendo is no stranger to hardware revisions: we've already had two versions of the Switch alongside the Switch Lite. Some fans are hoping for 4K visuals and a powerful SSD from the fabled "Super Switch".
But the company has publicly stated there are no plans to release a new Switch model in 2020 – so don't expect to hear more about the rumoured Switch Pro for a little while.