Apparently The Way of Kings did not crush enough pelvises and so Brandon will be using a bigger hammer for the sequel. In all seriousness though, the books of the Stormlight Archives are not slim volumes. Perhaps Brandon's editor feared that a book of more than a thousand pages called `The Book of Endless Pages' might be as cunning plans go only be worthy of Boldrick, and so nixed this as a working title.
Words of Radiance should be appearing of book shelves in time for Christmas
Word of Radiance will focus on Shallan, the academic that spent most of the first book semi dethatched from the rest of the characters. So since each book has it's flashbacks devoted to one character, we'll likely discover more about the `incident' that lead to the death of her father. Though no doubt if you chose to buy this whopper, it will have novellas worth of content for every character and at least one for description.