My theory About River Song (From DW)

River Song, one of the most interesting characters in New Who lore, mainly because we know almost nothing about her, but who is she, really? 

So far the three main theories about River Song (if that IS her name, nobody other than her has confirmed thst) have been:

- She's the Doctor's wife

- She kills the Doctor and/or a good man

- The Doctors Mother (apparently already unconfirmed by Moffat although it would be kinda plausable).
 
Either way she's seems to have been locked up in prison for an extensive period of her life, or so we think, the Doctor and her always meet at different points in her timeline.
Now surely if Moffat (the writer) is worth his stuff at all it won't be any of these (far too obvious seen as they've already been hinted at), and the best thing to do is turn it on its head completely.
So, what, apart from these main theories would be a smart, believable way to shock us about River Song?
I actually think that perhaps River Song isn't the big to-be companion or wife of the Doctor, why can't she just be an evil alien that just quite simply lyed to the Doctor about their future History? I mean sure, you have the Tardis Book that acts as her diary, but nobody's actually looked in it have they? It could be just blank pages for all we know! Perhaps by Episode 6-7 the Doctor is starting to doubt River Songs supposedly true claims about the future and takes a peek at the diary, only to find its completely empty? She has the potential to be DW's best villain just by fooling the Doctor into thinking they had a future together! Also, she could be working for the Silents (or perhaps she IS a silent, but her true form only shows up in a mirror or something?). She could have caused the Tardis to explode (just like the Doctor did in Amy's Choice). Or, perhaps she's the Rani...GOTCHA (no seriously that would really suck)! No, but really Alex Kingston could play a master villain, and has been manipulating the events of both Series (or perhaps she's not the real River, she's just impersonating her or something!) in a Timey-wimey way. It would explain the Daleks fear of her in The Big Bang as well, because she's so powerful and evil that not even a Dalek can keep its ¤¤¤¤¤ together in front of her. So, in short, my theory is that River Song will turn out to be evil. REALLY EVIL. Bear in mind that apart from that scene in the Big Bang that suggests a more evil nature about her I have nothing to back this up with and is merely speculation on the part of a over-hyped/exited DW fanboy. But even if River turns out to be a good guy in the end I think we can all agree that It will probably be one of those I-DIDN'T-SEE-THAT-COMING twists that might have something to do with the 'Silence will fall' arc. Either way I can't wait to see how Series Six pans out (only two months left!)...EXITING!