Sad news - his books were the closest thing I'd read that evoked the sheer world-building and shattering events of Tokien's Middle-Earth.
From the Wheel of Time Message boards :
Beyond expressions of sadness at Jordan's passing, I have no doubt the most frequent question/concern will be, "What happens to WoT?"
I talked with Jason about this. He said that Jordan has been dictating outlines and plot lines and everything else related to the final book. He used the phrase "army of writers" to talk about the people that were converting those tapes into written form.
It would appear that the final book will still be published, I'm sure details regarding that will work themselves out. So please be patient (as challenging as that might be), and for now let's focus on Jordan's life, writing, and the joy he brought to us.