The additions do little to improve or worsen the film. We see a young Lois Lane witnessing a teenage Clark demonstrate his superpowers by running faster than the train Lois is on. We get an extra scene with Brando as Jor-El. We get Ma Kent doing her best to sell Cheerios in what is an obvious commercial sponsorship placement. There are a couple of other very minor editions but that's just about it.
The best thing I can say about this "expanded" edition is that it is innocuous. I'll stick with the original, thanks, but no thanks.
1LR Review: 17 out of 20 - It's a Solid Hit!