Mistwalker announced not just the Terra Battle 2 but also the Terra Wars which is a new RPG game. The new title release on iOS, Android and on PC but the release date is unknown (not even the season).
According to Mistwalker the concept of the game is based on the Terra Battle series BUT the battle system will be different and it will be a new series. The teaser website, the Twitter channel and the Facebook page of the game is already opened. Until more information, pleas stay tuned.