They won't even tell us who the fallen enchantress is... theres money on Magnar.
I think its Lord Relias!
Nah just kidding 
so now that we're approaching release, has any information on the campaign been revealed? Is this subject taboo on the beta forums?
I haven not seen a lot of information about the campaign really, I know it have been told that the campaign itself will feel like playing a "Modded game", so they will ignore the base rules of the sandbox.
If you take a look at the artwork for the game, it suggests who the Fallen Enchantress is, and if you look through the lore-part of the creatures in the sandbox game you might also get clues to the story 
But that part is all guesses from me.
Sincerely
~ Kongdej