No idea how accurate this source is but there may be a Phineas and Ferb verison of Epcot's Kim Possible on its way to DCA. Remember grain of salt.
http://www.disneygossip.com/2010/07/phineas-and-ferb-coming-to-california.html
http://www.disneygossip.com/2010/07/phineas-and-ferb-coming-to-california.html
Word has come from the very top that Phineas and Ferb, the breakout cartoon from Disney XD, is the next franchise for the Mouse House. This means that you'll soon be seeing the whole crew from the show in theme parks, in Disney stores, on Radio Disney, etc.
While merchandise and music has a pretty quick turn around, it can take a bit longer to build up a whole attraction for a theme park. Never fear, Disney has a back up plan. It sounds impossible, but it isn't.
That enough hints?
Disney's California Adventure will soon be the home to the Phineas and Ferb Perry the Platypus Adventure. (They're still working on the name.) Think Kim Possible Adventure from Epcot, but in California and with Perry the Platypus in the Kim Possible role. There will be three or four adventures that take adventurers all around the park attempting to foil the plans of Dr. Heinz Doofenshmirtz.
I've done the Kim Possible adventure a couple of times and it's a terrific experience. I think it will merge perfectly with the Phineas and Ferb franchise. The Perry the Platypus spy character melds wonderfully with the format. All that's needed is a little animation for the hand sets and they can start running tests.