I remember reading another interview than the following. That was years ago, though and shortly after the 4th season was on German TV for the first time. But I've found this:
Interview with Brad Bruckner K-SITE: How was the cliffhanger (from "The Family Hour") supposed to be resolved in Season Five?
BRAD: It's starting to get a bit fuzzy in my mind, but Lois and Clark became very attached to the little boy who began to grow at an abnormal rate, turning into a pre-teen in a matter of a few months. He also began to develop super powers, not all of which he used responsibly, since he was a troubled kid. Turns out he was Kryptonian royalty, stashed by his mother to keep him safe from assassins. In the end he had to (tearfully) leave the only parents he'd ever known (L & C) and return to save his imperiled people.
It basically says the same as the interview I know - that Lois and Clark would have dealt with a super powered teenager. Somehow I'm glad they didn't do it...
