For all those who think Haibara would have gotten together with Sera if Sera was a guy, there was a story hole from the beginning. If Haibara and Sera even attempted to get together, either Haibara will turn back to Shiho (Which means it's safe to go out in public which means the BO is defeated and Conan turns back to Shinichi and gets together with Ran. We all know that's not going to happen any time soon.) or Sera shrinks by taking APTX4869. I mean, that's not going to happen unless Haibara actually gives the toxin to Sera or Gin has some extra and Sera just happens to piss Gin off and Gin force feeds Sera with the poison like he did with Shinchi. Seriously? What are the chances any of that would have ever happened?
Anyway, if Sera is really a girl, then my hopes for Sera being Bourbon are dashed. But a BO arc is seriously long over due. I still think Sera has something to do with the BO. Why else would a new character be introduce when a BO arc should be the next thing coming unless the two are related? I hope this Sera (and hopefully BO) arc will be exciting!