Here is a latest look at the new area for the Phineas and Ferb meet and greet, currently under construction near to the Muppets on the Streets of America. The meet and greet was previously announced to be opening on May 16 2011, but there have been suggestions this has now moved back to May 20 2011.
Here is a quick description of the new experience.
"Guests will be able to take part in an energetic and fun-filled meet-and-play experience with Phineas & Ferb at Disney's Hollywood Studios (scheduled to begin in May). Phineas and Ferb -from the popular television show of the same name -"know what they're gonna do today": they are going to make a movie all about their crazy adventures. With the help of guests and movie director Cletus Filmore, they will recreate some of their favorite moments...unless they are taking a break to meet with their adoring fans, signing autographs and taking pictures. The fun will take place near the exit to MuppetVision 3-D. "