Bandai has dated the beta for Gundam VS:

Strap in and hold on tight, BANDAI NAMCO Entertainment America Inc. revealed this past weekend that GUNDAM VERSUS will be receiving an open beta from 12:00am PDT on Saturday, September 2nd through 12:00am PDT on Monday, September 4th for the PlayStation®4 computer entertainment system. The open beta will include 94 Mobile Suits, all Striker units, and a variety of online and offline modes. The GUNDAM VERSUS open beta will be available for pre-load on Tuesday, August 29th.

PlayStation 4 system owners who are not PlayStation®Plus subscribers will be able to take part of this online open beta. Please note that the final retail version of GUNDAM VERSUS will require PlayStation Plus to play online when it launches on September 29, 2017.

Key GUNDAM VERSUS open beta dates:
August 29 – Pre-load available for the GUNDAM VERSUS open beta
September 2 – GUNDAM VERSUS open beta will begin at 12:00am PDT
September 4 – GUNDAM VERSUS open beta will end at 12:00am PDT