According to Trudy Morgan-Cole's post Titles: What's In a Name?, Lydia: A Story of Philippi is expected to hit the shelves late March. She ought to know. She is the author.
I definitely want to get my hands on a copy ASAP. I've only read one of her books so far, Esther: A Story of Courage, and I thoroughly enjoyed it. I'm thinking this newest book will be just as pleasant an experience. I'll let you know for sure when I read it.
In her blog post, Trudy gives a glimpse of how a book gets it's name. Very interesting.