Marvel Studios have announced the upcoming sequel to the movie "Thor" titled "Thor: Ragnarok," but even then, there's still no confirmed cast, director and a movie plot.

According to Cinemablend, while Chris Hemsworth is a slated cast for the movie, the others are still anticipating about their possible casting on the said sequel.

One of the major questions is whether Loki (Tom Hiddleston) will make a comeback. Hiddleston is currently promoting his movie "Crimson Peak." When asked about his possible participation on the next Thor installment, Hiddleston expressed his doubts, saying "I don't know. I won't be able to help it if I ever have to play him again, and I just don't know when's that gonna happen."

What's the obsession with Loki? In the last installment of "Thor," titled "Thor: The Dark World," Loki didn't actually die but returned with a different character taking revenge on Odin.

With Loki not making any concrete closure, fans are led to anticipate that he may be back for a bigger vengeance, and it's something to look forward to on the next "Thor" sequel.

A report from We Got This Covered implied that Zachary Levi may finally take the role in the movie after being unable to make a run for it when he was first offered because of his commitment to the movie "Chuck." Whether he's going to be part of the "Thor: Ragnarok" or not, his character remains to be seen.

In his interview, Levi said "I have no idea. They have not told me anything. I hope so. I think that'd be pretty fun to get the gang back together, The Warriors Three."

Levi is slated to play the role of Fandral should he ever be invited to join the group again. All actors rumored to be joining the cast of "Thor: Ragnarok" have current projects at the moment. None of them have actually confirmed any participation on the upcoming movie, but expressed their desire and appreciation should they ever play the role again.

Tom Hiddleston has been very visible on Marvel's events, especially during the Comic-Con where he attended and relished the attention given to his character on "Thor: The Dark World."

"Thor: Ragnarok" is in the works in conceptualizing the whole movie from its plot, director and main cast members.