Looks like we got a new update on the series!
Today at Annecy Festival it was revealed that the Spin-Off has been greenlit and will be called "Fosters Imaginary Nursery" and Bloo will be animated in CGI.
I feel like CGI is an odd choice to use on Bloo, but I could see them pulling it off.
Either way, I'm definitely excited for new Foster's content after all this time!