So, I'm not completely sure...but I think a 3rd Rio may be coming Spring 2017? Its supposed to have new characters in the film. Not too sure on the details, or the exact date. But I know its coming soon. As far as I've researched, 20th Century Fox will attempt to make 5 animation films in 2017 & 2018... But maybe one of those films being Rio 3?
If anyone could help, I'd really like to know. Many of my G+ followers are really anxious just like I am for a Rio 3.
But as far as I know, the possibility of a Rio 3 soon are very likely (98%)
Rio 3 Custom Made Poster