Toontown is closing on the 12th so the Princesses will be moving and to where is still the subject of speculation.
However, as Chiara said, a bunch can be found around the World Showcase. In addition to the ones she listed:
Jasmine is in Morocco at Epcot and in Adventureland at MK
Ariel is meeting in Adventureland at MK
Tiana is in the gazebo in Liberty Square at MK
Rapunzel is in the Storybook Garden at MK
Pocahontas is at Rafiki's Planet Watch at Animal Kingdom
Cinderella is really the only one that is hard to find outside of the Toontown meet & greet, so I assume she'll be moved somewhere else at Magic Kingdom when Toontown closes. Expo Hall is the ultimate destination, but my understanding is that the construction there might not be complete in time for the Toontown closure date.
Berlioz70, a CM who has been on the DIS a long time, is keeping a thread with all the news on the changes that you can find here:
http://www.disboards.com/showthread.php?t=2622159 When the new meet & greet locations are announced, she'll add that info to the first post in the thread.
There is also a great character hunting blog at
http://unofficialdisneycharacterhuntingguide.blogspot.com/ that has guides to each park's characters in the right sidebar.
Hope this helps a little.
