According to Techtastic, the patent filed in South Korea suggests an "electronic game cartridge". No further details are provided, but the design suggests a connection at the bottom of the device that could be used to communicate with a console. This would undoubtedly be in line with the May comments of the John Kodera games division, where he noted that "Instead of separating the portable games from the consoles, it is necessary to keep thinking". [portable gaming] as a method to offer more gaming experiences. "
It is possible, then, that the patent may be related to a future PlayStation console. Or it may not be anything. As Techtastic notes, Sony filed a patent in 2017 for a device that looked a lot like Nintendo Switch, but nothing else has come of that, so not all patents are turned into products. Still, it's clear that Sony is working on something, which will eventually become something that remains to be seen.