Goku’s new, now canonical version of Super Saiyan 4 not only keeps Goku at his much younger self (rather than boosting him to an adult form like in Dragon Ball GT), but does retain the fact that ...
Goku realized that he can’t really hold back anymore and fully unleashes his Super Saiyan 3 form. The form itself has already been seen through Vegeta’s shocking use of it earlier in the anime ...
And in the trailer for this show, we got to see a new Super Saiyan Goku form, which makes Goku look ... into Super Saiyan ...