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Thor gets an adversary besides Loki in 'Thor: Ragnarok'
Tentative reveal: No later than December 2015
What to look for: "Ragnarok" won't hit theaters until Nov. 2017, but Hemsworth will need to finish filming it before production on "Avengers: Infinity War" begins in late Fall or early Winter 2016. That means things will have to be underway for a Spring 2016 start and lots of "Ragnarok" casting announcements before Christmas.
- Gregory Ellwood