User blog comment:PlantyThePottedPlant/Random Topic Blogging III: Blog Harder/@comment-3395649-20130816225419

Welp, according to the canon wiki:

http://phineasandferb.wikia.com/wiki/User_blog:Mobo85/Walt_Disney_Studios_Cancels_%22Phineas_and_Ferb%22_Feature_Film

.....