So Goku is in the afterlife speaking through King Kai how he'll return for one whole day to compete with his friends in the tournament
Trunks: He flipped his lid.
Vegeta: No son, his father is coming back. Even I’m excited Kakarot. I look forward for another chance to defeat you!
Goku: We’ll see, anything’s possible. Miracles do happen.
EVEN WHEN DEAD GOKU STILL KNOWS HOW TO ROAST THOSE VEGGIES