User blog comment:Invasor Zim 10/A new cheese episode?/@comment-4736387-20120111003455/@comment-406459-20120111023359

I know one of the members of the Wiki confirmed this with Jon Colton Barry. Also, the Disney Book Group's catalog listing for Phineas and Ferb tie-in books reads in part, "Season 3 continues throughout 2011, plus, look for Season 4 to premiere next spring, where a two-part cliffhanger episode featuring Perry the Platypus is being planned! Also, look out for "The Teal Takeover" in 2012, featuring retail promotions starring Perry the Platypus!"