It was confirmed last summer that the 2 Broke Girls star would reprise her role as Darcy Lewis in the Marvel Studios follow-up to Thor.
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Asked about the project, Dennings told Metro: "I can't tell you a lot. I don't know exactly what they're releasing, so I'm not sure what I'm allowed to say.
"And if I say the wrong thing, I'm going to probably be assassinated. The experience has been fantastic."
She added: "I think the atmosphere of this movie is going to feel a lot more authentic for fans. I think that will be really cool."
Loki actor Tom Hiddleston has said that director Alan Taylor's Thor: The Dark World adds "an extra dimension".
The actor has also said that "we'll have to see" about a third movie in the series, admitting that the future of such franchises "all depend on the financial success of the one before".
Photo gallery - Chris Hemsworth on the set of Thor: The Dark World:
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