Ubisoft going to starts today the official Alpha Test of the For Honor in Japan at 20:00 (local Japan time). The test going to be available only for the PlayStation 4 users. It is unknown if later you can test it on PC / Xbox One or not.
Ubisoft with the Alpha test also opened the official Japanese forum for the testers. Here you can discuss about the game and share your opinions with the others.
The Alpha version game by the way will be the same as in North America and Europe. So, a few hours left and you can test it!