It should be the same as Pinocchio and Snow White, because in the Special features, Disney View is listed. meaning we will have the black bars on the side. So it's not widescreen. Every movie before Sleeping Beauty will have the bars.
I'll just add to Fabio's comment. Indeed, it uses "Disney View" which means you can choose to have black bars on the sides or Disney artwork on the sides (either way, preserving the original aspect ratio). Actually, I'm quite impressed with what a good job Disney has done with transferring these classics to Blu-Ray.