http://pixar.wikia.com/Newt
Sadly, this is a movie that never saw the light of day, because Pixar thought they would be unable to compete with two similarly themed movies and they shutdown the project.
But I am wondering about the possibility of the project being reactivated one day and the movie brought to completion.
At the time the announcement was made, Pixar had been working on this movie for 3 years.
4 years is the average time to make a Pixar movie, so that would mean that the movie was 75% complete.
I'm assuming this means Pixar had gone to production stage and were animating the movie.
Since this is the most time consuming task in making a Pixar movie, it is highly likely they had started to do this when the project was cancelled.
It is possible that Pixar archived all the production material (concept art, script treatments etc) and the data files involved.
Since Pixar likes to write new software for each new movie and they reuse the software for future movies, it's highly unlikely they just discarded the files involved completely.
Especially as they would have definitely reached the simulation stage (that's where all the technical problems in rendering the characters have been solved) and they would definitely want to keep that software for reuse.
If Pixar archived the material, where would they store it?
For the amount of data storage required, Pixar would need a dedicated backup server and quite a sizeable one.