I just got back from seeing WALL-E at the theater, and I must say that this is probably Pixar's best looking movie to date. There weren't any moments where I found myself in the uncanny valley, yet it was so easy to be immersed in the environment and forget it's an animated CG cartoon, especially during the earth scenes as they looked so...earthy. What was even more amazing is that the first third or so of the film had no real dialogue, yet you could totally understand what was going on between WALL-E and EVE through their actions. And even though WALL-E doesn't have a mouth or much of a face, you could gather so much about his emotions just by watching his eyes.
Without trying to spoil anything, I will note that the message that the second half of the movie delivers seems to go against Disney's company ideals. But the message didn't really detract from that much in my eyes, so definitely go see WALL-E if you have the chance! :)
Oh, and the cartoon short they had before WALL-E was really good as well :)