I have a feeling it'll be 3D, since Pixar doesn't seem to make fully live-action movies. Although, they did use live-action in WALL-E. On the other hand, a live-action film would be interesting. I'm guessing it'll probably explain in a little more detail why Sid is such a bratty kid. And needless to say, I'm sure the film will probably end with his traumatic encounter with Woody, and how he grew up to become a garbage man.

Yes, becuase it would give us a took take on what happened to Sid after the events of Toy Story (1995), and how his behavior with toys would affect him as an adult.