Vector going to starts the official open beta test of the Rumble Burst in Japan on December 15, 2016. The game will be a basic free to play TCG browser game but it will be available only in Japanese.
Everyone can join to the OBT using your VectorGames, Nico Nico App or Hangame account. It should be noted that the OBT going to ends one day before the official service starts! According to Vector the final version will be available from 2016 Winter