Correct, there are no events from Superman II in Prequel #3. At this rate, S2 doesn't appear to be in continuity (Like Singer said), so it hinges on Lois' issue. That one may have some ties to S2. Although, It's highly unlikely. Everyone in the film was tied to the events of the Zod Gang. Without them, Superman would still be powerless (No reason to get his powers back). So that means Superman couild not have slept with Lois, as Lara tells him in S2: "If you want to live with one of them, you must become one of them."
And no evidence of the Zod Gang, because if S2 was still in continuity, the Luthor issue would show him interacting with them as per the movie, but it was non-existant. So, unless they're going to HEAVILY rewrite the events of S2 (Which would be useless) so that it fits, it's not in continuity. Which means Lois and Clark didn't sleep together (I refuse to believe Singer would propose such an event happened off screen) and Luthor has never been to the Fortress.