If latest reports are to be believed, 'Thor: Ragnarok' will possibly be the third as well as the last solo Thor movie from Marvel Studios. Collier quotes actor Chirs Hemsworth confirming that his contract with the studio will expire after he completes his shooting for 'Thor: Ragnarok' as well as 'Avengers: Infinity Wars' Part I and Part II.
According to Christian Today, the contract of Robert Downey Jr. to play the role of Iron Man expired with the first 'Avengers' film, but it was extended with a view to feature him in many more films counting 'Avengers: Age of Ultron' as well as 'Captain America: Civil War.' Therefore, as of now, it is still unknown whether or not Chris Hemsworth would be extending his contract also after his role in 'Infinity Wars' is over.
However, the contract issue may not actually matter largely because, as of now, there is only one film from the Marvel Cinematic Universe that will release after 'Avengers: Infinity Wars Part II' - and that movie is likely to be 'Inhumans.' As Thor is unlikely to have any part in 'Inhumans,' it may not be necessary to extend Chris Hemsworth's contract any further.
Nevertheless, one thing is certain and that is Chris Hemsworth's return in 'Thor: Ragnarok.' In any case, 'Thor: Ragnarok' bears the name of Hemsworth's character all over. According to a recent report in Venture Capital Post, the plot of 'Thor: Ragnarok' may culminate in the end of Asgard, home of the celestial beings, counting Thor himself.
The report further said that as mentioned in Norse Mythology the title of the movie mirrors the end of the world. In Norse Mythology Loki escapes from his prison and helps Surtur, the Fire Giant, in wiping out the world of the Nordic gods. In case the plot of the film even slightly follows this story, it would suggest that big things are to come for the third 'Thor' film.
In fact, the plot, as told in Norse Mythology, may mean the end of particular characters like Odin (Anthony Hopkins), Heimdall (Idris Elba), as well as Loki (Tom Hiddleston).
As of now, 'Thor: Ragnarok' is scheduled to hit theaters on Nov. 3, 2017. Its original release date was July 28, 2017.