The following contains major spoilers for Thor: Ragnarok. Do not continue until you've seen it.
While Thor: Ragnarok isn't the final chapter of the Marvel Cinematic Universe prior to Avengers: Infinity War, it is the last one that we expect will have major roles by any of the actual Avengers. Fans expected that we'd get some setup for the big crossover event, and while some was certainly hinted at, the film ended by giving us more new questions than answers.
Where exactly will everybody end up when Avengers: Infinity War starts? We don't really know much at this point. Here's a rundown of all the questions we find ourselves asking following the events of Thor: Ragnarok.
Where is Lady Sif?
When Hela arrives on Asgard she pretty much lays waste to the entire place. What appear to be hundreds if not thousands of people, including the Warriors Three, end up dead. However, the fate of one character is left ambiguous. Lady Sif is completely MIA. The reason that Sif didn't appear in the film may have had more to do with the actress' schedule than anything else, but the fact that Sif's fate isn't clear means it's possible that she's actually still alive. We don't know for certain that she was even on Asgard when all this went down. Did she die off screen, or did Jamie Alexander's schedule leave her alive to fight in the future?
Is Banner Stuck as Hulk?
When Bruce Banner finally regains control of his big green buddy we learn that not only has Hulk been in control for two years, Banner wasn't even aware of it. Mark Ruffalo's character says at one point that he's afraid that if he makes the change again, he might not ever be able to come back. Then, he goes on and makes the change. The specific question of who's in control at the end of the film is never addressed, but we see that even in the closing moments of Thor: Ragnarok, Banner is still in Hulk form. So it's possible, even likely, that he can't change back-- at least at this moment. How will this impact the events of Avengers: Infinity War if only half of the Incredible Hulk is around?