Entertainment Weekly has the answer:
Pixar announced two very peculiar animated features, both of them what-if concepts that immediately raised more questions than the studio was ready to answer.
“We’re going to announce two new films no one has ever heard about. Original films,” emphasized Pixar and Disney animation chief John Lasetter [sic], rousing cheers from the auditorium at Disney’s D23 fan convention, where the news was revealed. “You’re the very first group anywhere in the world to hear what these are about. But I’m not going to tell you about it. I’m going to let the filmmakers tell you.”
So are we …
