Yeah, he did say that, but its still a missed opportunity imo.
Imagine a scene at the end, maybe the last scene. Bruce is down in the batcave relaxing after defeating whichever villain was in Batman 3. He sits at a large desk, surrounded by computers and screens. He clicks on each screen, and a different view of the same city appears.
Alfred walks in with a tray and says something like ''still looking for the flying man in Metropolis master Bruce?'' ''he's just an urban legend you know''.
Bruce could look up and say ''not looking, I found him.'' Bruce points to a large computer monitor. A small camera placed on a rooftop catches Superman as he's flying by. Bruce and alfred lean in toward the screen and we see the \S/ on supes chest as he wheezes past. That's where it would end.
Something simple as that would make the movie going crowd geek out.