Looks like Annecy has come once again, giving us more news on the upcoming spinoff! It appears the show has been renamed yet again, this time to “Foster’s Funtime for Imaginary Friends”, personally I prefer this over "Foster's Imaginary Nursery".
"Creator of “Foster’s Home for Imaginary Friends,” is back with a completely new original series targeting pre-schoolers. In it, a now-young group of preschool imaginary friends learns from an immature elder friend, Bloo, who, as in the original, still unintentionally gets things wrong. McCracken has promised the same fast pace but a fun, simpler structure and less cynical humor. Only Bloo and Madame Foster return."
Source
Also included in the source is our first piece of key art for the show, I think this style looks really nice!