It looks like the trailers we have seen may actually only be showing us the tip of the iceberg when it comes to this movie. I'm betting that most of it will not actually take place on Earth at all, although 95% of what we've seen so far takes place there.
It's a pretty safe bet that Pixar is going to hit it out of the park again with this movie. There's a part of me deep down inside that wishes desperately that they'd get into live action movies because their animated films are so awesome without exception.
There's a larger version of the image below...
You can click on the image above to see a really HUGE version of the picture over at AICN.