With American Horror Story: Coven officially over, fans are beginning to speculate about what the season 4 concept will be.

American Horror Story co-creator Ryan Murphy previously said that season 4 will take place in 1950 and feature star Jessica Lange using a German accent. While many have guessed that season 4's concept would be a circus or communism/the Red Scare, Murphy suggested that both concepts would not happen.

Speaking with Entertainment Weekly after Wednesday night's Coven finale, Murphy said that "no one has completely guessed what [the concept] is" after being asked directly if it was American Horror Story: Circus. He also noted that no one online has guessed the concept, implying that the Red Scare might be out as well.

Though he did not tease much more about season 4, Murphy said that the tone would be similar to Coven.

"Next year will be equally as challenging, because so much of it is period and bizarre and crazy and gothic," he explained. "My feeling is, if you loved this season, you'll love next season. It has the same sort of comedic tone to it."

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As for which Coven cast members will be returning for American Horror Story season 4, Sarah Paulson revealed to The Hollywood Reporter that she is probably on board.

"I'm on track and that is the plan," Paulson revealed. "I don't know how many clues were in [Coven]; there was one clue a few episodes back. I know what Ryan is thinking but until he announces it, I feel like anything can change."

She added that she knows what Murphy has in mind for the concept but not the entire scope of it.

"I know what he has in mind for me, and I hope it happens because it would be one of the more exciting things that I've gotten to do," she teased.

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Lange has already been revealed to be in for season 4, but this will be the actress' last season with American Horror Story.

American Horror Story season 4 will air in fall 2014 on FX.