Rio 3 (Blue sky studios version)

Rio 3 was a planned Blue Sky Studios animated film, but it never got a release.

Early development
After the premiere of Rio 2, both Carlos Saldanha (Director of the first and second installments of Rio) and other actors mentioned some possible plans for a third film. Saldanha mentioned the following:

"It’s a little early, granted. I want to see how Rio is accepted by the audience, and how people take this sequel. Of course, I have a lot of stories to tell, so we’re [starting to] prepare for it. Because we love these characters so much, and there are a lot of things in my head that maybe I couldn’t put in the movie. I wanted to take them to a different place. So I don’t know yet. We’ll see what happens." In addition to the statements, a profile of a former worker of Blue sky studios was discovered, in the profile the projects in which he worked are mentioned, even mentioning projects that were never released, among which is Rio 3, mentioning Carlos Saldanha as director. This would show that Rio 3 was really in the pipeline and that there was some work on this third installment (Part of the information and the profile of the ex-worker can be found in the link of the video of the Espía negro user, who collected information about the canceled projects of Blue sky)

The work done so far for Rio 3 is unknown.

Plot
It would have taken place after the events of Rio 2, but the actual plot is unknown.

Why It Was Cancelled

 * Although there is no precise reason, the closure of Blue Sky Studios shut down on April 7, 2021 makes the development of the film impossible, unless Disney decides to do it themselves.
 * It has been announced that a series or film focused on supporting characters Nico and Pedro would be coming to Disney+.
 * On January 12th, 2022, Disney confirmed that Rio 3 is in development for Disney ——— “The feature projects include the next installment in the “Ice Age” franchise, the next installment in the “Rio” franchise and an animated feature version of the “Night at the Museum” movie franchise for 21 Laps Entertainment and Disney+.”

Results

 * Even though Blue Sky Studios closed, it has been announced on the production notes of "The Ice Age adventures of Buck Wild" that Jim Hecht (co-screenwriter of the film) is working on Rio 3, so Disney will continue with the development of the third installment of the Rio franchise.
 * A video game of Angry Birds Rio 3 was never released.

Cancelled Blue sky projects video
The video with the information made by Espía negro: https://www.youtube.com/watch?v=onzNcAZztSg&t=38s

(In spanish)

Another resource: https://www.tvlaint.com/2021/09/se-revelan-otros-titulos-cancelados-de.html (Also in spanish, but with a link in english)

Resource

 * 1) http://web.archive.org/web/20140415144913/http://www.cinemablend.com/new/Rio-3-Cast-Tells-Us-Where-They-Want-Go-Sequel-42545.html