Harriet McDougal, Robert Jordan's widow and the editor of The Wheel of Time series, recently told Dragonmount that she expects the WoT Encyclopedia to be handed into Tor Books for publication later than originally expected.
While attending the first annual JordanCon In 2009, Harriet said that she was under contract with Tor to create an Encyclopedia which described the world, its characters, and its history in greater detail (!). Also likely to be included are things like ranking lists of channelers, and rosters of Aes Sedai Ajahs. Harriet also said that the Encyclopedia was due to be handed into Tor "one year after A Memory of Light was completed". If that were true, then the Encyclopedia would be handed into Tor by January, 2014, and likely published a few months later.
But Harriet is now saying that she currently estimates the Encyclopedia will be handed into Tor around June of 2014, for a later summer or Fall 2014 release. This timeframe is by no means set in stone, but that's currently where things are at.
We'll have more news as it comes in.