Who the hell i s river song?????/?

just seen a preview of saturdays prog dr who web page and it shows river song telling the dr that in hte future she someone who he can really trust thats why she got sonic screwdriver and she calls him yan wasnt the masters name b4 he changed yana is this a timelord name thing and then she said that she was going to prove to him that she can be trusted and says im sorry im so so sorry and leans to his ear to go tell him something but then it cuts off ........ BUT ive just seen a video on you tube called time war a sham and its puts a differnt perspective on the whole timelord thing which could explain alot to what the fianle is going to be like oooohh my god im so obssesed lol what does anyone else think about all this spoiler thing.......