I have no idea, but at this point nothing would surprise me. Ok, maybe it could. I was surprised it turned out to be the real Christian.
I wonder if maybe he's going to admit that he's really in love with Natalie. Or maybe one of the secrets is Christian's DNA test. Christian did ask John not to tell Natalie the truth. Christian seemed to think it would be better for her to think him an imposter than to wait while he's in jail for Tico's murder. ???
It's also possible at least one secret has to do with his deceased wife. That's a storyline they really haven't played yet.