Sony is looking to the future, as companies often do, by trademarking possible names for its future console generations.
All trademarks, spotted by Gematsu, are for home console devices. This news isn’t particularly surprising; companies often move to secure trademark rights well in advance of the product existing.
This does not mean Sony will continue to use the same brand name and just add a number for its future generations, only that it wants to ensure it has the rights to do so whenever it needs them.
As Gematsu notes, PS4 and PS5 brand names were both trademarked in 2006, well before these consoles had existed. For now, we can patiently wait the arrival of of PS5 next holiday season.