According to this blog entry, the next book by Laurell K. Hamilton will be titled 'Divine Misdemeanors'. It's to be the next Merry Gentry book and it's going to be a somewhat different story from the other books in the series. Which makes sense, as the goal of those first books was for Merry to get pregnant. Now that's been achieved so Laurell is going to have to come up with something new. According to Indigo Books, Divine Misdemeanors is to be released at the end of October.
I know I'm looking forward to it (along with the other book she's working on, currently titled 'Skin Trade', which is to be released at the beginning of June).