Raymond E. Feist shared the news on his Facebook page: the old title for book 1 has become the new series title! And the first two books have been renamed "Embers and Steel" and "Blood and Flames". Seeing as there's no plot for book three yet, there's no title yet either!
A note. I've finally decided on titles. The series is King of Ashes. Book I: Embers and Steel. Book II: Blood and Flames. Book III: to be decided. Back to work!
The book hasn't been plotted yet, so title suggestions are premature.
Source: REF FB page post.