Sony Interactive Entertainment has filed trademarks for “PS6,” PS7,” “PS8,” “PS9,” and “PS10” in Japan, likely as security for future PlayStation platforms.

This sort of trademark security is a regular occurrence for Sony. Here is a history of “PS” trademarks in Japan:

“PS” (trademarked in 2000, released in 1994)

“PS2” (trademarked in 1999, released in 2000)

“PS3” (trademarked in 2005, released in 2006)

“PS4” (trademarked in 2006, released in 2013)

“PS5” (trademarked in 2006, released in 2020)

In related news, Bandai Namco trademarked “Supo-kyun!” in both logo and text forms, as well as “Men’s☆Party.”

Sega Games trademarked “Meikodayo” and “Kaitodayo,” which are the full-body Nendoroid versions of Vocaloid characters Meiko and Kaito

Thanks, @piercesword.