Will destruction of the Vale be explained?

Hey all,

So I just got onto the PTR and after getting all my bars and what not set up, I teleported over to the vale and took a look around. All the destruction is cool and everything but one thing I noticed is that I can't find any reasoning behind it?

My question is, is there a quest or something that will be in live 5.4 that will explain exactly what happened to the Vale and why it happened? I feel like there should be some explanation instead of just logging on and thinking "Hey the vales different, Sha must have been pissed and blown $%!@ up."

So anyone know? Did I miss a quest or storyline somewhere? I haven't done a whole lot of investigating yet. Thanks in advance for any info.

Tswizzle