Vad händer med den gula ringen efter Green Lantern-filmen?

Spoilers att följa:

Obviously, the guardians or whoever were going to keep the ring until Parallax was defeated. However, they held onto the ring after that. A scene after the ending credits shows Sinestro taking the yellow ring. He removes his own green ring and puts on the yellow. His entire suit changes to yellow. Then he looks outward past the camera and you see his eyes are yellow as well.