Hey Gher,

There are some more hints about this idea in the prologue. I have been going on about the idea for a while at Theoryland, especially since Jason's review was posted at Dragonmount (somewhat spoilerish):

If you thought Rand was hard before, you haven’t seen anything yet. As I read this new book, my heart just went out to him. I was completely engaged as I witnessed him go deeper and deeper into depression and insanity. We’ve all known that Rand has been going the wrong way emotionally for a long time. But in this new novel, Robert Jordan and Brandon Sanderson took him to a place I never thought he would go. There is a scene towards the middle of the book that was so dramatic and intense, that I … I don’t even know to say it. As a long time fan of the novels, it rocked me to read it. I had to set the book down and let it soak in. Remember the intensity of Dumai’s Wells at the end of Lord of Chaos? This is like that, minus the armies. I am certain that in the years ahead, we’ll run polls on DM for the “Best Scenes in the Series”, and this will be one of the popular choices. Trust me. You’ll know it when you read it.

This made me think immediately to the Aran'gar idea, because there is only one thing that really has the potential to make Rand go deeper into emotional turmoil, orinsanity (killing a woman). But I find it likely that Rand will find out exactly who Aran'gar is (or was), because he has to find out somehow that the Forsaken are being transmigrated into new bodies after he kills them. This has the potential to make Rand realize that he is linked to Ishamael, which would open up a whole nother can of worms.

In any case, it was made clear enough when Narishma brought Rand's proposal to the rebels that the Asha'man who were friends with Eben, perhaps many more of them, feel they have a blood debt to pay. It seems likely that some sketches will be produced in short order.

Also, I have thought for some time that this conflict between Rand and Aran'gar would happen in Arad Doman, since she has had to flee the rebel camp, and she was making an alliance of sorts with Graendal. There is some info in the prologue that strengthens this belief quite a bit, and it goes right along with what Jason said in his review.

I don't believe that killing Aran'gar will solve all of Rand's problems when it comes to these women who have died for him. Moiraine will probably be necessary for that, and I don't think we will get that until book 13. But killing Aran'gar will make things interesting, I think.