What will happen in this book?
Right now, you're guess is as good as ours. Besides the usual speculation, Robert Jordan has teased us with this info that was found on Tor's website.

At ComicCon in San Deigo, CA, Robert Jordan said the following about one of the events in Knife of Dreams:

Something that has previously happened in the series is going to be revealed to have a terrible cost.... When you read it your reaction will be, "Gasp. How horrible!"

When RJ was asked for more info about the origins of Mat's ancient memories, RJ replied with:

... At least a partial answer will be coming up in the next main sequence book...

hmmmm....

Also, the way Robert Jordan is talking, this next book seems like it may start to deliver on a lot of exciting events:

I think [Knife of Dreams] will have enough incident to satisfy anyone, certainly.

In April 2004, Amazon UK published a general summary of the book. It's an unofficial summary, and nothing that came from Robert Jordan or his team. In other words, it was written by somebody who had no special inside information about the next plot.

RJ Said: "Something that has previously happened in the series is going to be revealed to have a terrible cost." He added, "When you read it your reaction will be, 'Gasp. How horrible!'"

La Saidar souillée!La Saidar souillée!
...Quoi? j'ai souhaité ça à voix haute? oups

A mon avis, ça a plus à voir avec le nettoyage de Saidin. Du genre, maintenant que c'est clean, floraison d'Ashamans un peu partout et recrutement forcé par Taim.

pour le terrible cost ... et si c'était Moiraine ?

oui mais quoi? elle reviendrai barbue ou avec un cerveau de lige? , parceque le retour de Moiraine en lui même tout le monde s'y attend plus ou moins...

Si j'avais les mêmes migraines qu'elle et si j'étais seul dans mon cas, je me poserais des questions...

Mat qui donne la moitier de la lumiere du monde pour sauver le monde... On va avoir un borgne c sur...

Terrible cost... je pense que c'est la bourde de Elayne etc... avec le peuple de la mer ou alors la redite en vrai (et non dans un certain ter'angreal d'une sceance de torture et rdv d'egwene avec 13 Myrddrals et AS noires, amon avis...

les aellfin...