OBT date for both Japan and Korea region has been confirmed through live press conference as 16 January 2020.
For interested individuals, you may refer here for the Japanese press conference video. And in case someone want to know more about the cosplayer Iori Moe that was introduced inside, this is her Twitter account.
There are also speculation where Global region (US server) will share the same OBT date, seeing Apple Appstore displayed the very same date in their description. We certainly hope this is true and will be posting about it as soon as we received a confirmed news from YoStar!