I really had another thought recently - and it would appease the Clark should be Superman by now crowd.
When Lois&Clark was first proposed to ABC years ago the idea was that it would be a Superman series where Superman was discussed but was never seen on camera. What if Superman does reveal himself this season but we never see him on screen? What if he's talked about, his exploits are referred to, but we never actually see Clark in the suit? I think that could be one possibility that they're going for.