I think one of the biggest indicators of what is happening with the Wardens is this concept art of Blackwall.

Here's Blackwall, who seems to be taking off his Warden's Oath, symbolically severing himself from the Wardens. In the background, several men are dead and another man seems to have been spared execution only by his hangman's rope being severed. Possibly by the 2-handed blade embedded in the gallows.
Who were the men to be executed, and why? Was Blackwall among them? What have the Wardens done to make him leave? It's raining, so you know it's supposed to be sad. Have the Wardens betrayed their oaths, or have they decided to remain neutral, even as the Breach poses a threat as great as the Darkspawn? Whatever has occurred, why is Blackwall not a part of it?
So many questions upon questions, I fee like it's an episode of Lost. The question is, where is Matthew Fox?