It's being said that Hela will be the villain of Thor: Ragnarok, most likely played by Cate Blanchett as Mark Ruffalo previously let it slip she is playing a big baddie.
According to Geek.com, Hela will be similar to her comic book counterpart (ruler of Hel and the realm of Niflheim) and will make her way to Asgard where she will be in "cahoots with Tom Hiddleston's Loki."
• Hela might replace Death in the MCU (which may mean Thanos is in love with Hela and the two battle the Marvel heroes in Avengers Infinity War).
• Hela and Loki's plan (currently unknown) will have well been underway before Thor realizes what's going on.
• It's said Hela is responsible for an incident which leads Thor on a journey in the film.
• Thor gets banished from Asgard.
• Hela destroys Thor's hammer, Mjolnir.
• Odin (which sees Anthony Hopkins return) has fled to Earth where he wanders around as a "end is near" crazy-looking street-corner hobo warning of the coming Apocalypse (Ragnarok).
"Thor: Ragnarok" has a November 3, 2017 release directed by Taika Waititi also starring Chris Hemsworth and Mark Ruffalo.