I believe it was the end of the Thanos Imperative line in the comics where Starlord, Drax and Nova trapped Thanos in the cancerverse (and themselves) to stop him. I think the next movie will have a similar ending but they use the Quantum Realm instead and it'll be Tony or Cap who gets trapped with him. It'll be a good way to end with leaving the door open for Thanos or the hero to return later if they need.
I also think the after credits scene will be Silver Surfer talking to Galactus but that one is just pure desire on my part.
I also think the after credits scene will be Silver Surfer talking to Galactus but that one is just pure desire on my part.