I have thought some of the same questions as the ones above. I think Gideon's rapist was definetly a man - Gideon refers to him as male every time. I also think Gideon took revenge on his abuser and that the guy may not be alive or was hurt so bad that he's hiding out somewhere scared. He may even make an appearance in EWY and it becomes Eva's turn to get revenge for Gideon - that would be kinda cool. I think the stage has already been set for Gideon's abuser to either show up or the story of what Gideon did to him to come to light. I don't believe his dreams where Gideon's the aggressor are just fantasy; I think they're real life memories. And now having killed Nathan... what kind of dreams will Gideon start having now! I so can't wait for EWY.
I also wonder who the other doctor was that Gideon's mom took him to see and what was his motivation for lying? Are these doctors Elizabeth knew before hand and they lied about the abuse because they were victims of the ponzi scheme Gideon's father tricked people into? Somehow I get the feeling that Gideon's past is going to be shockingly bad. 10x more than Eva's. Come on May 7th.