The official Avatar Facebook page announced that Avatar begins production on the movies and release the below image:
Great to be working with the best team in the business! Avatar takes flight as we begin concurrent production on four sequels. The journey continues December 18, 2020, December 17, 2021, December 20, 2024 and December 19, 2025!
James Cameron previously told the Star the filming on the Avatar movies is an "epic undertaking":
“What people have to understand is that this is a cadence of releases. So we’re not making Avatar 2. We’re making Avatar 2, 3, 4 and 5. It’s an epic undertaking. It’s not unlike building the Three Gorges dam. (Laughs) So I know where I’m going to be for the next eight years of my life. It’s not an unreasonable time frame if you think about it. It took us four-and-a-half years to make one movie and now we’re making four. We’re full tilt boogie right now. This is my day job and pretty soon we’ll be 24-7. We’re pretty well designed on all our creatures and sets. It’s pretty exciting stuff. I wish I could share with the world. But we have to preserve a certain amount of showmanship and we’re going to draw that curtain when the time is right.”
Sam Worthington, Zoe Saldana, Stephen Lang and Sigourney Weaver are confirmed to return for the Avatar sequels.