New game appearance, Sony is running a mysterious countdown

It became clear that Sony is doing countdown with a new game.

The announcement page contains "Β (beta) testIt seems that it is a title that made use of the network apparently because the phrase "is written.

Details are as below.
Β
http://www.jp.playstation.com/scej/marusen/


According to the official page of Sony Computer Entertainment, it is said that we will start beta testing of new game titles and something else at 10:00 am Thursday, June 17 (Thursday).

A countdown is done on the current announcement page, and a sound like thunder is flowing in the back. The URL of the notification page includes "MarusenAlthough there is a letter called "thunder," what does that mean?