It's all speculation, but over at Superman Cinema, they have the most inside information, and it's currently not all that hot.

"New ending" meaning "new when compared to the original version of SII."

Plus, Lex and Miss Tessmacher's extra scenes are not being restored. Nor the Arctic Patrol scene not being restored, which could leave the SR sequels open to Zod, powerless but certainly still alive on Earth, waiting to be restored.

I'm gonna be in the editing room on this, I can tell already. Sheesh.