I'm not sure how reliable Amazon listings are, or what exactly this entails, but I've recently noticed Phineas and Ferb is listed for a Blu-ray and DVD release on Amazon.com. No other info is given.
Now, I don't mean to get anyone unnecessarily hyped, but could this be for a future season box set of the series? Would be nice if so.
EDIT:
Don't know how I missed it, but a quick look at the "Product Details" section reveals what this is for. The Writers and Directors for it are listed as "Dan Povenmire, Jeff 'Swampy' Marsh, Michael Arndt" and "David Hoberman, Sean Bailey, Todd Lieberman", respectively. Sound familiar? That's because these are the people working on the upcoming P&F theatrical film. Seems this is just a REALLY early product page for the movie's eventual home media release. Sorry everyone. :P