"Dat blade has shiny eye. Always watchin us. Why you not see?
Three lies. Da first one been told.
Bound by day throne? No. Free. Free!
Da next gonna come soon. Maybe dey see dis one."
-Ogmot the Mad
"King Varian Wrynn gave his life to save his people. He knew that no one, not even a king, is more important than the Alliance."
-Anduin Wrynn
Anduin has always been a man of peace. He knows what it is more important to protect. My speculation is, if he has to betray the Alliance to save the world, he will. And he may not be the only one, remember that Saurfang wants to speak with him while Sylvanas and Genn are thirsting for war. Maybe this two characters are the ones who will show us in-game who real threat is.
Anduin Wrynn is now the High King of the Alliance and King of Stormwind. When the prophecy talks about a throne, it may be talking that Anduin is not bound to the throne of the Alliance (yeah, I know its not like a king title, it is a figurative way of speaking), but to himself and the rest of world, not only his people. He might choose the major good, to try and save everyone, even if he betrays his friends and loved ones. He is free of the yoke of the Alliance. Maybe this is the reason why the Old Gods are telling us about the lies. They want us to acknowledge them so we can end the treacherous ones.
You know who also has an eye, a big one eye, C'thun. What if he, somehow, has taken control of the Silithus' sword, like it happened to Voldrassil in Northrend, and is now using it to see through it? Sargeras is imprisoned, so he may not be in control of the sword anymore. And yes, I know it is stated that C'thun is dead, but the Old Gods are neither dead or alive. They have, a different status. And their corruption is always there.
Remember this is just a speculation. You don't need to flame me. Thanks!
Edit:
1. The spoiler is about Saurfang talking to Anduin since it is datamining. Some may know about it, some not.
2. This is the first lie, we do not know the other two for now.
3. This must had happened while the Goblins were mining in Silithus since the third page talks about it and the lie part is the fifth. But remember that time can be difficult to calculate in the Warcraft lore.
4. IMPORTANT - Please don't talk too much about Jaina and other things non-related to the post. There are many posts about it so go there. Thanks.