Eternity

This may be just another Easter-Egg. However, like the Stan Lee cameo, it could have a great impact on the future of the Marvel Cinematic Universe. Eternity isn’t just an abstract entity; as the leader of all cosmic entities, he’s the most powerful. Interestingly, there were hints of this in Ant-Man, as well.

When Ego reveals his true plan, Peter Quill’s eyes turn black; not just black, but black like the night sky, with stars all over the place. Of course, that could have meant anything, but he adds that he sees Eternity. There’s very little doubt that Eternity has been properly introduced to the MCU as an abstract entity !