I have a friend that worked with Pixar for six months last year, just around the time all the "Pixar hates Disney" issues came out, and Pixar told the world they were leaving the magic kingdom for better deals.

From what he told me about the inside attitude of Pixar, I would find it VERY hard to see them being involved with any movie produced by Disney, since "Cars" is the last one they are doing together.

Too bad, as I would love to have seen Pixar build the world of Tron - instead we may have the MCP with a giant pair of mouse ears, and ICP's dancing to "On Off, On Off, it's off to RAM we go..."