I have to agree with nightwing on this. For all that I like Lois and am glad that she and Clark/Kal are now married, it was shown time and again pre-Crisis that Kal-El loved other women, most notably Lyla Lerrol the Kryptonian actress, and Lois would have been at most a substitute. I think Alan Moore nailed that point in his famous birthday story (the name of which escapes me) where Superman is captured in the Fortress by Mongul, who uses a plant that gives the victim an illusion of their perfect existence. Kal's perfect universe had him living on Krypton and married to Lyla. Sorry, Lois... and Earth, for that matter!
Having said that, this did vary a lot as writers changed, and what I describe above was the situation in the Weisinger years and for some time thereafter. But, in both the early years and the immediate pre-Crisis 1980s, there was more of an attempt to have Clark (in either identity) and Lois in some form of relationship. Elliot Maggin and Cary Bates were the champions of this in the later period, doing some excellent stories -- and, ironically, it was Alan Moore who wrote the story "Whatever Happened to the Man of Tomorrow", which could be considered as the final SA/pre-Crisis Superman story, and our hero ends up married to Lois!
FWIW, I think the Earth Linda goes to is meant to be a homage to the Silver Age. It has that same "clean" and, to later, jaundiced, eyes, slightly unreal feeling -- and the Superman resembles both the SA Supes and his recent reappearance in the first Dominus story that followed on from "Superman Forever." As for who the "extra" Superman/boy is, I wonder if this is yet another case of putting a Superboy into an era where, if he was Superman as a boy, he wouldn't exist. These days, we have Kon-El as well as Kal-El, but DC seem to forget on occasion that Superboy was originally Kal, too; they've done it at least once, and this could be a repeat. Or it could be a result of the (teenage?) Legion coming to the wedding -- why, deponent knoweth not.
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