Dozens of Dragon Ball GT references have already been found in the Super Baby 2 and Super Saiyan 4 Gogeta trailer for Dragon Ball FighterZ

Many attacks in Dragon Ball FighterZ clearly take references from the manga, anime and movies featuring the Dragon Ball universe. It seems that Super Baby 2 and Super Saiyan 4 Gogeta from Dragon Ball GT also feature attacks and techniques

Dragon Ball FighterZ - Super Baby 2 & Gogeta Super Saiyan 4 Reveal Trailer @ ᴴᴰ (60ᶠᵖˢ) ✓

Random Book 9 - Gogeta Blue Dragon Ball Xenoverse 2 - Wattpad

Baby, Dragon Ball Wiki

What if Broly was found in Dragon Ball GT? - Quora

Dragon Ball FighterZ Adds Super Baby 2, SS4 Gogeta Soon - GameSpot

Dragon Ball FighterZ - The Cutting Room Floor

Dragon Ball FighterZ News, Rumors and Information - Bleeding Cool News Page 1

Super Baby 2 to join Dragon Ball FighterZ on Jan. 15, Super Saiyan 4 Gogeta announced - Dot Esports

Gogeta, Dragon Ball Wiki