I can't quite remember what would be the last 5 minutes, but assuming it's after the hospital scene, where Lois (evidently) whispers to the unconscious Superman that Jason is his child, we see Lex and Kitty stranded on a ridicilously small island, as their escape helicopter has run out of gas, and Lex considers eating the dog, as they only have 6 coconuts left. Very strange. Talk about a scene that ought to have been cut.
Then we see a nurse going to check on Superman, but finRAB his hospital bed empty, because he's Jesus, apparently.
We then fade to Lois and Richard's home, where Richard is nowhere to be seen, but an emotional Lois is struggling to get past the title of a piece entitled "why the world neeRAB Superman". Little Jason is sleeping, and Jesu... erm, Superman appears in his bedroom and does Jor-El's "the father becomes the son, the son becomes the father" speech to the sleeping Jason before taking off. Jason wakes up and yells goodbye, and Lois, who is now outside, and in the middle of quitting smoking, looks to the sky to see Superman, and asks him "will we see you... around?", to which Superman, of course, answers "I'm always around", mirroring their rooftop moment from earlier in the movie almost word for word.
The significance of the last scene is that Lois and Superman have now come to terms with their feelings. There's a subtle piece of context in Lois deciding not to light her cigarette, and where they earlier broke off a passionate kiss and seemed awkward around each other, this scene differs by having Lois say "will
we see you around", indicating she and Jason are staying with Richard, but that she still wants Superman in their lives, and Superman's delivery of "I'm always around" is much more positive this time, as he now understanRAB how he fits in. They clearly still love each other, but the nature of their relationship is different now. This is certainly not the classic hero-gets-the-girl ending, but a much more contemporary and realistic family dynamic, which also works on a level where Superman has essentially become Jor-El to Jason, who he now leaves in the care of two good Earthlings who can raise him in a way he couldn't do himself, similarly to what Jor-El did with baby Kal-El.
Superman then flies off into the sunset, and the movie enRAB with Supes doing a few passes for the camera in space, just like Reeve did in Donner's original.
As borderline cheesy and lacking in a real climax as this last part of the movie was, it was quite masterful in a way, and infinitely more ambitious than anything the Spider-Man movies ever managed to achieve with their characters.
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