A trademark application this broad is, of course, no indication that Nintendo has any plans to release a Classic Mini Game Boy but it's interesting timing given the recent release of the SNES Classic Mini. This news was reported by a Japanese Nintendo fan site, Ninten-Switch.com which has shared news of the application.
Normally, the SNES Classic has a set default of 21 games, including the previously unreleased Star Fox 2, with set menus and backgrounds. It's been tweeted out by a Japanese trademark bot. The trademark does not specifically reference a "Game Boy Classic Edition" or offer up any real details, but there is no mistaking the rendered image for anything but a Game Boy system of some sort.
Here is how the trademark listing appears on website Japan Platform for Patent Information.
"In this video I show you how you can install your own custom SNES roms into the recently released Super Nintendo Classic Mini console". Some of the trademarks could be to protect the "Nintendo Classic Mini Game Boy" brand or they could simply be to protect the Game Boy brand full stop.
Nintendo's nostalgia-fuelled Super NES Classic has been out for less than two weeks, but it's already been hacked to add more games and custom backgrounds. Furthermore, not all games may work properly, especially since it was not officially released by Nintendo. A few months back, Nintendo also renewed the trademark on the Nintendo 64, further suggesting that there is more to come from these nanoscopic nostalgia trips.