The latest issue of TIME magazine talks a little about Pixar Animation Studios upcoming slate:

"WALL * E"
(June 27th 2008)
Set in 2700. WALL * E, is described as a space-set remake of a 1931 Charlie Chaplin film about a blind girl wooed by a tramp she mistakenly believes is a rich man. Transferring the setting to a lonely planet, WALL * E is a cute little robot doing what he was made for - until he meets a female robot names Eve. "Star Wars" sound designer Ben Burtt will electronically voice the main roles, and writer-director Andrew Stanton ("Finding Nemo") will serve again in that capacity.

"Up"
(June 12th 2009)
A 'coming-of-old-age' story which follows an elderly man befriends a clueless young Wilderness Ranger and gets into lots of globe-hopping, ass-kicking adventures with villains and beasts whilst still eating dinner in the early afternoon.

Toy Story 3
(Summer 2010)
Lee Unkrich, co-director of "Toy Story 2" and "Finding Nemo", is "just starting to write the story" for a third film.