Although I still have a doubt on Shion's true gender, it looks like the rumor I posted was completely untrue.
Hm... Anyway, Suou's identity was revealed, so Shion's ability and objectives become main concern now. There are rumors, but I couldn't find an intersting one except this. Shion cannot only clone human body, but also copy and reproduce other things such as whale (ep10) and folded-paper crane (ep01). What about if he/she wants to copy and reproduce the Gate? This is a rumour hanging around at the moment.
However... whatever happens in next episodes, the conclusion of this season will be likely to be "a fangirl saved the world!", unfortunately.