(Facebook/Avatar)"Avatar 2" is speculated to arrive in theaters on Dec. 21, 2018.

Even though four new "Avatar" sequels have been announced, filming for "Avatar 2" has yet to begin. But according to actress Sigourney Weaver, this is for good reason.

Weaver, who played Dr. Grace Augustine in the first "Avatar" film, explained that James Cameron, the mind behind it all, is still carefully planning everything out.

"I think what he's been doing is trying to develop the technology," she said in an interview at The Monster Calls. "We're going to do all four simultaneously, so I think he's trying to make sure that he has really done all the groundwork so when he really starts these four we'll be able to hit the ground running."

She also revealed that Cameron is in the middle of experimenting, but she remains unsure if any of his experimentations will make it to the final product. It seems that Cameron is taking all his time to plot everything out so that once production begins, nothing will be left to chance.

As Weaver pointed out, all four sequels will be shot simultaneously, but that doesn't mean that it will premiere the same way. There will obviously be intervals in between the release of each movie, given the heavy post-production process that will be involved.

No release date has been set for the film thus far, but it has been speculated that the first sequel will land in December 2018. This stems from a list that Fox released, outlining the release dates for various films it has planned. An untitled Lightstorm Entertainment film is due to arrive on Dec. 21, 2018. Since Cameron founded Lightstorm Entertainment, it didn't take a lot of time before people started to connect the dots. However, while speaking to The Hollywood Reporter, Weaver also weighed in on the possible 2018 release.

"We haven't started it, so I don't know how realistic that date is, but I think it's going to be very exciting," she said.

Right now, nothing can be known for sure, so readers are advised to take this with a grain of salt.