This from the author's LiveJournal:
As for that book . . . well, it's time for it to have a title. We've been calling it Shifting Winds up until this point, but that was never intended to be the final title. After a long round of conversations with Tor and Harriet, we settled on TOWERS OF MIDNIGHT as the title. There are various reasons for this, which I'll go into more once the book is out next year. I'm pleased, however, as this was the title I suggested. It's actually appropriate in an interesting way. Harriet was the one who came up with the name for the first of the three, and the second one gets the title I proposed. And so, we will (as I've been saying for a while) use Mr. Jordan's title for the final of the three, A MEMORY OF LIGHT.
I thought for a while on that last choice. If you've been following along these last couple of years, you know that my original intention was for this to be one book. When it was split, I still wanted it to be one book in name, in an attempt to honor Mr. Jordan's wishes that it be one book. (I still plan to suggest an omnibus edition at a later point, but the three books together will probably be too long for that to be an option.) Anyway, I was going to have A MEMORY OF LIGHT be the title (along with a subtitle) for each of the three books. When that fell through, I was left thinking on my next step.
Mr. Jordan named the final book A MEMORY OF LIGHT. It's one of the things we have from him, and I wanted very badly to use it. But at the same time, he named the three books AMOL, and I wondered if it wouldn't be better to let fans think of them as AMOL together, never using the title itself in case we managed to get that omnibus done. In the end, however, I decided that the title was simply too good not to use. I can't count on that omnibus, and I feel that using the title on the last third of the book is the best way to honor Mr. Jordan's wishes. It wasn't an easy decision, and some will disagree with it. But it is what we're going to do. So, the three books are:
THE GATHERING STORM
TOWERS OF MIDNIGHT
A MEMORY OF LIGHT
You guys all know how pissed I am that A Memory of Light has been split into three volumes. Still, Towers of Midnight is a cool title, especially since it appears that there should be a certain focus on the Seanchan.
And unless you are living in a cave somewhere, you should be aware that you can now purchase the prologue from The Gathering Storm here.