This is from an email his publicist sent me a few minutes ago:

#1 New York Times bestselling author Brandon Sanderson leaves on-tour tomorrow for The Alloy of Law – and as part of his tour promotion for this book he’ll be “hosting” an innovative digital scavenger hunt for the millions of his fans anticipating the final volume in the Wheel of Time series (out November 2012):

http://www.tor.com/blogs/2011/11/the-alloy-of-law-tour-will-unlock-a-wheel-of-time-secret

Sanderson has created an encoded page on his website for an exclusive, secret piece of content relating to the final Wheel of Time novel, A Memory of Light. The page can only be unlocked once all 35 individual codes have been found and entered – with each individual code printed on the back of a Wheel of Time “snake” bumper sticker (image attached) that has been concealed in a copy of Sanderson’s The Alloy of Law somewhere along his book tour. Fans can participate, speculate, & follow-along on Twitter at hashtag #wotgh.

Sanderson’s tour begins tomorrow, and “The Great Hunt” should be a really cool game for his fans to get excited about the epic conclusion of The Wheel of Time, A Memory of Light, due out next November 2012.