Back in May, Cameron was quoted as saying that he is “in the ‘Avatar’ business. Period. That’s it. I’m making ‘Avatar 2,’ ‘Avatar 3,’ maybe ‘Avatar 4.’
But then in June, Showbiz 411 said: “Then she films ‘Avatar’ 2, 3, and 4 with James Cameron. That’s right: they’re making three sequels to the blue 3D phenom all at the same time. Weaver says she has no idea how long it will take, or how it’s going to work. ‘I just show up,’ she said.
It’s likely that Weaver never even said anything about a fourth movie and that Showbiz 411 was just presuming the next three movies would be shot at the same time.
Either way, producer Jon Landau just told the Courier Post that they are only working on the next two films right now. We [are] doing two back-to-back, but not a third.”