In declarations to Famitsu, Hiroshi Ueda has stated that Sony (SCEJ) may be planning an event before Tokyo Game Show. In this event, always according to Ueda, Japan specific game will be announced.
At E3, not many Japanese games were announced. Square-Enix was one of the few companies that showed some of their products such as FF XV and Kingdom Hearts 3 for Playstation 4 and Xbox One, but we didn’t see much about other Japanese developers.
Remember, TGS, is a video game expo-convention held annually in the Makuhari Messe, in Chiba. This year the convention will take place between September 19 and 22.