Following on from the Aliens teaser trailer for Toy Story 2, the studio put out a teaser trailer featuring made-for-trailer material to showcase an upcoming project -
Monsters Inc - only this time the footage introduced brand new characters and a brand new movie universe. That's innovation for you right there, and it's no coincidence that most Pixar teasers follow this approach now. I remember the first time I saw this, being blown away by Sulley's fur, which had been the big talking point of pre-production, and by the chemistry between the two leads, which was arguably better even than the dynamic between Woody and Buzz, even at this early stage... http://youtu.be/cvOQeozL4S0