There are still no official information about it, but according to some rumors, it seems that the Goku of Dragon Ball, Dragon Ball GT can be one of the next playable character of Dragon Ball FighterZ.
This is what was reported by Nibel through a message on Twitter, which in turn connects with what is reported by the always well informed Ryokutya2089. As you well know anyone who has seen the series Dragon Ball GT, Goku is inside of this finds himself again a child because of a Pilaf’s wish, forced then to travel the universe in the company of Trunks and Pan to save the Earth in an alternative history. In fact, therefore, it would be a form of Goku, version of the child (or boy, considering that it has around 12 years of age).
A desire recurring in the community of Dragon Ball FighterZ is actually the Goku and the young of the first series ever and this could be a sort of response by Arc System Works and Bandai Namco, even if the characterization and the references are obviously different. It would, however, of the fourth version of Goku after the base, SSJ Goku and SSGSS Goku, or even seventh, if we consider mergers and Goku Black.
Looks like.. GT Goku is coming to Dragon Ball FighterZ
via https://t.co/HjVFVV2Dkb pic.twitter.com/0GjtEL0JnC
— Nibel (@Nibellion) march 15, 2019