I think it is right that Lara will be queen of winter, there are a couple of hoops that need to be jumped through. Mab will die at some point, that seems inevitable. That means Molly will become queen of winter, which Mab told Dresden that she wasn't ready for and the result would be bad. She told Dresden that he would have to kill Molly if that happened. Mab is a b**** but she is not someone who lacks foresight. Dresden is going to have to kill Molly, Then Lara is a likely candidate to take the Queen of Winter title. I have a feeling that Fae weddings are a bit more involved that mortal ones, there are going to be some pretty heavy issues to deal with.